reference now will be made in detail to the embodiments of the invention , one or more examples of which are set forth below . each example is provided by way of explanation of the invention , not limitation of the invention . in fact , it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention . for instance , features illustrated or described as part of one embodiment , can be used on another embodiment to yield a still further embodiment . thus , it is intended that the present invention cover such modifications and variations as come within the scope of the appended claims and their equivalents . other objects , features , and aspects of the present invention are disclosed in the following detailed description . it is to be understood by one of ordinary skill in the art that the present discussion is a description of exemplary embodiments only and is not intended as limiting the broader aspects of the present invention , which broader aspects are embodied in the exemplary constructions . in describing the various figures herein , the same reference numbers are used throughout to describe the same material , apparatus or process pathway . to avoid redundancy , detailed descriptions of much of the apparatus once described in relation to a figure is not repeated in the descriptions of subsequent figures , although such apparatus or process is labeled with the same reference numbers . an embodiment of the present invention may be seen in reference to fig1 in which a conventional commode 10 having a reservoir tank 12 is situated on a base 14 . a lid 16 may be provided as is conventional within the art . a commode seat 20 defines an upper surface 22 , a lower surface 24 , lower surface 24 having a flexible gasket 25 which provides a substantially air tight seal between the seat and the rim 18 ( fig2 ) of the commode . seat 20 further provides an exterior edge 26 and an inner edge 28 , the inner edge 28 surrounding the opening 29 defined by seat 20 . as best seen in reference to fig4 the commode seat 20 is formed of two separate halves including an upper half 36 and a lower half 38 . upper half 36 and lower half 38 may be secured to each other by a plurality of dowels ( not illustrated ) which engage a plurality of aligned apertures 39 with the respective seat halves 36 and 38 . the provision of upper and lower seat halves facilitate the construction of the air pathways and placement of operative components as will best be described below . however , other conventional attachment mechanisms such as a snap - fit configuration , adhesives , or other joining hardware may be used between the respective halves . seat 20 defines an air intake that is preferably located along either an inner edge or bottom surface of seat 20 . in one embodiment , intake 30 comprises a slot defined along an inner edge 28 of the seat . however , as seen in fig2 a plurality of intakes 31 may be provided as an additional or sole means of air intake . the intake 30 is in communication with an air plenum 40 , the shape and direction of air plenum 40 best seen in reference to the directional arrows in fig3 and 4 . the directional arrows indicate the flow of air through plenum 40 , the air movement being controlled by a fan such as a blower motor 60 . the operation of blower motor 60 discharges air from a blower outlet through outlet 32 defined by seat 20 . the movement of air generated by blower 60 establishes a substantially circular air pathway of air entering intake 30 and continuing through plenum 40 . the pathway of plenum 40 passes the moving air through a first filter 50 . filter 50 is preferably a mesh - type pre - filter contained within a filter cartridge 52 . cartridge 52 designed to operatively place filter 50 within the pathway of air plenum 40 thereby forming a portion of the pathway when the filter is inserted . in a preferred embodiment , the airflow enters through a bottom of filter 50 and exits through an upper surface of the filter . the first filter 50 thereby provides a transition point from the air plenum 40 contained within the lower half 38 and upper half 36 . as best seen in reference to fig4 air entering the bottom of filter 50 exits the opposite side and continues along an arcuate portion of plenum 40 positioned within the upper half 36 of the commode seat 20 . the air path is in further communication with a second filter 50 and filter cartridge 52 configured similarly as to the filter previously described . the second filter 50 contains activated carbon to help in the removal of odors . as seen in reference to fig4 and 5 , the first and second filters 50 and cartridges 52 are adapted for being inserted into and received by a slot and housing defined within the interior of seat 22 . this removable cartridge facilitates the periodic replacement of the various filters 50 without the necessity of disassembling the seat . further , the edge - accessible cartridges provide easy access compared to rear mounted or bottom mounted filtering media . however , a variety of different filtering media may be used and having different configurations , so long as air flow through the filter is achieved and the filter composition has sufficient filtering qualities to remove or treat bathroom odors . upon exiting the second filter 50 , air is directed along plenum 40 to blower 60 . an intake of blower 60 receives the air and discharges the air from blower 60 through seat outlet 32 . as seen in reference to fig4 a battery source 70 is provided within a housing defined within the interior of seat 22 . power supply 70 may be provided by conventional batteries , including a rechargeable battery pack . if a rechargeable power supply is used , it is convenient to provide an access port 72 for a conventional connection for a re - charger . electrical leads 74 connect the power source 70 to blower motor 60 . further , switch 80 , seen here in the form of a rocker switch , may be provided to control the operation of the blower fan 60 . if desired , a pressure contact switch 82 may also be used to limit operation of the blower fan 60 to intervals when the seat 20 bears the weight of a seated individual . for either type of switch , it is desirable that the switch be responsive to a timer circuit so as to provide for a 10 - minute interval of operation before the blower motor is automatically turned off . use of the timer circuit conserves battery life and also provides for an interval of operation once the user has left the bathroom facility . the illustrated embodiment is constructed from a conventional wooden toilet seat . the air plenum 40 and associated housings for housing the battery supply 70 , the fan blower 60 , filters 50 , and other structures related to the operation of the air filtering system , may be milled or routed from the wood . one having ordinary skill in the art would be able to provide an equivalent structure from molded plastic or other materials . however , a wooden seat remains the material of choice for most consumers . further , the wood construction maintains the seat strength when constructed in accordance with this invention . the strength of the resulting seat is also enhanced by making use of both the upper and lower hemispheres to define the various compartments and air pathways so that the structural strength of the seat may be maintained . for instance , air plenum 40 is initially defined within the lower seat half 38 before engaging filter 50 . the air plenum 40 continues from filter 50 along the plenum pathway defined solely within the upper half 36 . this arrangement insures that air flow must pass through filter 50 along this pathway . the reverse arrangement occurs with respect to the second filter 50 which directs air passing from the upper to the lower surface of the filter through a portion of the air plenum now defined within lower seat half 38 . the illustrated embodiment set forth above uses two filter cartridges that are aligned in series along the inner pathway . it is understood and appreciated by those having ordinary skill in the art that depending upon the efficiency of the air filtration cartridge , a single cartridge may be operative to remove odors associated with the use of the commode . if desired , an existing cartridge or additional dispenser may be adapted or provided within the air flow to release a masking scent or air freshener . it has been found advantageous to use a blower motor such as a delta motor bf b0512h manufactured by delta motor company , long beach , calif . the delta blower motor is compact , very quiet in operation , and provides a sufficiently high volume of air flow and pressure drop to bring about the desired displacement of air from the bowl region of the commode and through the toilet seat air passage . the first filter 50 may be provided by a hepa filter such as aca 5030 available from duracraft corporation , south borough , mass . the combination of filters provide effective odor control , a sufficiently long service life , and have a compact design allowing them to fit within the confines of a conventional commode seat . the second filter 50 may be constructed of conventional activated carbon material and configured within the housing for receiving air along an upper surface of the filter and discharging the air along the lower surface of the filter and into the lower half of the commode seat . one suitable commode seat for practicing the present invention makes use of a beamis brand seat having model number 400 - bp available from beamis manufacturing , shegowgane falls , ml . this particular model is a wooden seat having a very thin profile . accordingly , by sizing the components to fit within a thin seat , allows the same design to be adapted for thicker seat structures . the power supply 70 may be removed along an access opening defined along the rear edge of the commode seat . the compartment housing the power source 70 is tightly configured so as when a fresh battery supply is inserted , the required electrical connections are reestablished as is conventional within the art of battery - operated devices such as cellular phones , calculators , and the like . an additional embodiment of a toilet seat is seen in reference to fig6 - 9 . the illustrated additional embodiment provides a more compact air plenum defined within a side portion of the seat as best seen in fig7 . while the additional embodiment is illustrated in the form of a continuous , round toilet seat , it is understood and appreciated that the compact nature of the present invention will also fit within a conventional horseshoe shaped seat . as best seen in reference to fig6 and 7 , a bottom 24 of the seat 20 defines a plurality of apertures 31 or other air inlet ( s ). the apertures 31 are positioned along an inner portion of seat bottom 24 relative to the gasket 25 positioned on the lower seat surface . the seat 20 is adapted for receiving , in response to a fan or other forced air flow means , a supply of air through the apertures 31 , the air being directed upwardly through the seat and through a carbon - activated filter seen in the form of filter 50 contained in cartridge 52 . upon exiting the filtration system , the filtered air flow , as indicated by the directional arrows , is conveyed along a plenum 40 that is partially formed within an interior length portion of the seat to an adjacent blower 60 . the blower 60 has an inlet 62 in communication with the air passageway and serves to pull air in through the air apertures 31 and filter 50 . the resulting filtered air flow exits the blower 60 along an outlet 64 . a seat air outlet 32 is defined along a rear edge of the seat through which the air is discharged . as best seen in reference to fig8 and in reference to yet another embodiment of fig1 , the toilet seat may be in the form of a conventional wooden seat . the seat is split along the median cross section so as to divide the seat into a solid upper half 36 and a solid lower half 38 , each upper and lower half having its own respective unitary character . as set forth in more detail below , the resulting cavities , air plenums , and component housings may then be milled or otherwise formed within the respective solid halves 36 and 38 . thereafter , the two halves may be joined using wooden dowels or other interlocking engagement means such as adhesives , engaging cams , fasteners , or friction fit engagement so as to provide an integral seat . in reference to fig8 the lower half 38 has defined therein an air passageway 40 that includes a first cavity 51 . the cavity is adapted for receiving a slide - in cartridge module 52 seen here in the form of a two - stage parallel filter element . the filter media of a granulated activated carbon may be contained within a cartridge or other housing to facilitate the insertion and removal of the filter element . the upper seat half 36 has a similarly positioned cavity 53 defined , which , when the toilet seat is operatively assembled , is positioned above the filter cavity 51 of the lower half 38 . the upper cavity 53 further defines a ledge 55 for receiving a resilient gasket 56 . the gasket 56 helps provide for an air tight seal about the filter and filter cartridge and thereby directs air flow into the adjacent position of air passageway 40 defined within the upper seat half and in communication with the upper cavity 51 . as seen in reference to fig7 and 8 , the air passageway 40 provides for air flow as seen by the directional arrows , the air passageway being in communication with an adjacent blower motor 60 . the blower motor 60 is positioned within a housing formed between adjacent surfaces of the upper seat half and the lower seat half . air exiting the blower is discharged along a portion of the air passageway 40 which may be defined by sections of both the upper and lower seat halves . as illustrated , the air exits through an outlet 32 defined by the seat such as lower seat half 38 . additional details of construction of the additional embodiments are similar in respect to the features described in the first embodiment . in addition , it has been further found useful to include a timer circuit 73 that automatically turns off the blower motor following the passage of a pre - selected time interval . a time interval of between 3 to 4 minutes has been found useful . given the quiet operation of the fan , the automatic cut - off switch is useful to prevent battery drain for users who may forget to manually disengage the unit . an aspect in the operation of the present invention is the ability to provide for a strong flow of air through the granulated carbon filter . a suitable blower motor such as a brushless blower by delta electronics , inc . ( taipei , taiwan ) model number bfb0505ha . a suitable blower provides an air flow rate of about 3 . 2 cubic feet per minute . this volume of air flow blower provides a sufficient flow of air through the seat including the attendant pressure drop across the filter . since the air passageway occupies a compact volume , the volume of air that needs to be moved is kept at a minimum , thereby increasing the efficiency of the air filtration process . it is also envisioned that the operative electronics , switches , filters , fan , and a defined air passageway including inlets and outlets may be provided within a single unitary cartridge or similar module . as such , the cartridge could be inserted into a conventional toilet seat that has an appropriate segment milled out or pre - molded for receipt of the unit . as seen in reference to fig1 through 13 is a third embodiment of a commode seat . in this embodiment the air flow passageways , filters , blower motors , and other components of the ventilation system are defined and housed within structures milled from the bottom surface of a solid commode seat . as seen in reference to fig1 , a commode seat 120 is provided having a lower surface 124 having a flexible gasket 125 which may extend around a circumference of the seat bottom and provides a substantially air tight seal between the seat and a rim of the commode . seat 120 defines an air intake 134 that is defined in a detachable cover 150 . cover 150 , as best seen in reference to fig1 , is sized and shaped so as to engage the underlying components and structures of the ventilation system and to provide for a substantially smooth and flush juncture with the surface of seat bottom 124 when engaged . while not separately shown , gasket 125 may extend across the surface of cover 150 . air intake 134 is positioned opposite a filter housing 151 which has been milled from the commode seat . filter housing 151 is adapted for engagement of a filter 152 , one surface of filter 152 opposite the intake and a second filter surface opposite an air plenum 140 that is defined below ( relative to the orientation seen in fig1 ) the filter housing 151 . as described in reference to other embodiments , filter 152 may be in the form of a slide - in cartridge that may be inserted and removed through an exterior edge portion of the commode seat . as best seen in reference to fig1 , air plenum 140 extends in a direction toward a rear of the seat to a point opposite a blower housing 161 which houses a blower motor 160 . as seen in fig1 , blower 160 defines an inlet 162 which is in communication with air plenum 140 . in operation , blower 160 directs air from air intake 134 , through filter 152 and into plenum 140 . the filtered air is then directed to inlet 162 , the air passing through blower 160 and exiting blower outlet 164 . air exiting outlet 164 is directed into an air passageway 142 before existing along a rear edge of the seat through outlet 132 . blower motor 160 is powered by a battery supply 170 which is positioned in a battery housing 171 . adjacent the battery supply 170 , a timer circuit 173 may also be provided which provides for automatically turning off the blower motor following the passage of a pre - selected time interval . a conduit 175 is also defined within the surface of the toilet seat , for containing electrical leads 174 which extend to blower motor 160 . in addition , leads 174 are in further electrical communication with a switch 172 , seen in the figures as a push button switch . switch 172 and a re - charger port 180 are positioned within a common housing 181 . as best seen in reference to fig3 housing 181 is in communication with respective openings defined within an exterior edge of seat 120 through which access to the re - charger port 180 and switch 172 may be provided . as best seen in reference to fig1 , the milled out portion of the commode seat also defines a recessed surface 190 which is defined a sufficient depth below the surface 124 of the seat so as to receive cover 150 in a substantially flush engagement and orientation with the surrounding portions of the seat bottom 124 . as best seen in reference to fig1 , an insert 155 is used in the assembly and construction of the commode seat . insert 155 defines a bridge including a filter seal region 157 which is adapted for forming a portion of the housing 151 for receiving filter 152 . as seen in reference to fig1 , the region 157 of insert 155 defines a portion of groove 153 , groove 153 adapted for receiving a gasket ( not illustrated ) to provide for an air tight seal between filter 152 and filter housing 151 . as further seen in reference to fig1 , air plenum 140 extends below insert 155 , insert 155 helping to define a portion of air plenum 140 in the region between filter housing 151 and blower housing 161 . by use of insert 155 , the integrity of the air plenum 140 is maintained and unwanted entrainment of air into plenum 140 is avoided when blower 160 is in operation . as a result , the overall integrity of the collective air flow passageways is maintained , preventing loss of pressure . blower efficiency is thus maintained by providing air passageways that which are essentially closed along their lengths . air enters the system only through the intake and exits at the outlet . no additional sources of air flow or entrainment are present , maintaining the high efficiency airflow which allows a rotary blower motor to develop the necessary pressure to draw air across the filter . the embodiment seen and described in fig1 through 13 affords highly efficient air flow properties while maintaining maximum strength of the commode seat . by milling the air passageways and component housings from a solid commode seat , the overall strength of the solid seat can be maintained . in addition , maximum efficiency of blower motor 160 is achieved by providing a well defined , air plenum 140 and passageways 142 in which filtered air is moved through an interior of the seat before being discharged through outlet 132 . by providing air flow passageways through the solid commode seat structure , unwanted air entrainment from surrounding regions is prevented . for instance , in a hollow commode seat environment , the large open volumes contributes to air entrainment and well as minimizes the necessary pressure drop needed to achieve the maximum air flow from the bottom of the commode seat through the ventilation system . further , other operational components of the ventilation system , such as the power supply , lead lines , and switches , are positioned in separate housings which also minimizes the air volume the blower motor may engage . by maintaining small housings which are spatially separated from the air flow pathways , a maximum air flow efficiency through the filter is obtained . it is preferred in one embodiment of the invention that the commode seat utilize a solid commode seat such as one made from wood . this allows the seat to have sufficient strength and rigidity following the milling of the appropriate cavities , air plenums , and housings such that the strength and operation of the seat is not impaired . however , a plastic toilet seat , including hollow plastic seats , could be equipped with a slide - in cartridge . alternatively , a plastic seat may be molded to include the appropriate cavities and housings that are described in the above embodiments . a useful process for manufacturing a commode ventilation seat includes : providing a solid toilet seat ; a cavity within the toilet seat , the cavity adapted for receiving a filter housing ; and , providing an air passage defined within an interior of the solid toilet seat , the air passage in communication with an inlet defined by the seat , the passage being in further communication with the cavity and with a fan housing defined by the seat , the fan housing being in further communication with an air outlet defined by the seat . an alternative manufacturing process can be provided by supplying a toilet seat ; defining within the toilet seat a cavity ; inserting within the cavity a cartridge , the cartridge defining an air passage in communication with an air inlet defined by a cartridge surface , the air inlet and air passage being in further communication with a filter element , the filter element being positioned within an air plenum or passage defined within the cartridge and operatively engaged by a blower motor , the blower motor positioned within the air plenum and adapted for directing a discharge of air through an air outlet defined by the cartridge ; the cartridge further defining a power source such as a re - chargeable battery for operating the blower motor , the blower motor responsive to a switch for selectively engaging the blower motor . as discussed , this type of cartridge , having all of the necessary components and passageways pre - defined , can be inserted into a conventional toilet seat in which an appropriate cavity is milled , molded , or otherwise provided . such a unitary cartridge insert can be used with virtually any type of toilet seat construction , including plastic seats which are molded so as to inter - engage the cartridge insert . although desired embodiments of the invention have been described using specific terms , materials , and methods , such description is for illustrative purposes only . the words used are words of description rather than of limitation . it is to be understood that changes and variations may be made by those of ordinary skill in the art without departing from the spirit and scope of the present invention which is set forth in the following claims . in addition , it should be understood that aspects of the various embodiments may be interchanged , both in whole or in part .
an improved apparatus for ventilating bathroom odors of a commode is provided . the apparatus provides a seat containing an entire ventilation system including an intake , an air plenum positioned within the interior of the seat . at least one air filter is positioned within the air passage . a fan or blower motor is used to move air through the air passage and the filtered air exits through an edge of the seat , the blower fan controlled by a battery pack contained within the commode seat . an external switch activates a timer that controls operation of the ventilation system . the replaceable filter is accessible from an outer edge of the commode seat .