the novel features of the present invention will become apparent from the following description of the preferred embodiment , and as illustrated in fig1 through 11 . the present invention is an hourglass - shaped cold brew coffee apparatus 10 , which comprises a filter assembly 11 , a brew chamber 12 , and a carafe assembly 13 . the carafe assembly 13 is comprised of a center tie piece 14 and an extract chamber 15 . referring to fig2 through 5 , the filter assembly 11 includes an outer cup 16 , an inner housing 17 and a micro - fine wire mesh 18 that filters out coffee grounds from the infused water . the outer cup &# 39 ; s structure comprises a substantially flat surface 19 and a rim 20 opposite and connected to the flat surface 19 by four connecting members 21 , which leave four large openings in its side walls . four arced leg members 22 on the flat surface 19 of the outer cup 16 serve as feet to support the filter assembly 11 on any flat surface as the filter assembly is filled with coffee grounds . the inner housing &# 39 ; s 17 structure comprises a first rim 23 and a second rim 24 connected to the first rim 23 by four connecting members 25 , which also leave four large openings in its side walls . the second rim 24 projects outwardly from the exterior of the inner housing 17 . the wire mesh 18 is secured between the outer cup 16 and inner housing 17 so that it is exposed from between their connecting members 21 and 25 , thereby enabling the coffee extract to pass through . the side walls of the outer cup 16 are slightly sloped towards the flat surface 19 and the side walls of the inner housing 17 are slightly sloped towards the first rim 23 , so that the inner housing is telescopically received in the outer cup . in addition , the external dimensions of the inner housing 17 are substantially equal to the internal dimensions of the outer cup 16 , leaving a small clearance between them to firmly accommodate the wire mesh 18 . the outer cup 16 includes three holes 26 around the periphery of its flat surface 19 and a projecting section 27 , which radially projects downwards from the flat surface 19 . the projecting section 27 extends into one of the connecting members and forms a groove 28 on top of the flat surface 19 . the interior of the flat surface 19 includes a radially oriented groove ( not shown ) for receiving the first rim 23 of the inner housing 17 . the first rim 23 includes three projecting members 29 and a groove 30 on one of the connecting members . the projecting members 29 are suitably designed to snap into the holes 26 of the outer cup 16 . in order to secure the inner housing 17 inside the outer cup 16 , the projecting section 27 is received in the groove 30 of the inner housing and the projecting members 29 are snapped into the holes 26 of the outer cup , by pushing the inner housing inside the outer cup . but , first the wire mesh 18 is wrapped around the inner housing 17 before it is secured inside the outer cup 16 . a gasket 31 or an o - ring is placed between the rim 20 of the outer cup and the second rim 24 of the inner housing . referring to fig6 and 7 , the brew and extract chambers 12 and 15 are identical and constitute approximately one fourth the size of the whole apparatus 10 , representing the ends of an hourglass shape . the interior of the bottom surface of the brew chamber 12 includes a cylindrical depression 32 that is adapted to receive the second rim 24 of the inner housing 17 . the gasket 31 placed between the rim 20 of the outer cup and the second rim 24 of the inner housing helps in achieving a secure fit between the filter assembly 11 and the brew chamber 12 . referring to fig8 a and 8b , a first cap 33 a is attached to the brew chamber 12 . the cylindrical depression 32 in the interior of the brew chamber leads to a cylindrical projection on its exterior bottom surface . the first cap 33 a is adapted to be firmly attached over the cylindrical projection . a second cap 33 b , similar to the first cap 33 a , is attached to the bottom of the extract chamber 15 . several designs and structures are possible for the caps , one of them being shown in fig8 a and 8b . the caps act as a base and further include a plurality of gripping pads 34 made of rubber or other anti - slip materials . the center portion of the caps may include a logo button 39 , which can be snapped in the hole 40 . even the gripping pads can be snapped in the caps . referring to fig9 a and 9b , the center tie piece 14 is hollow and comprises two conical members 35 a and 35 b connected at their vertices . the center tie piece 14 is approximately half the size of the apparatus 10 . the inner surface of the conical members includes pour lips 38 . the brew and extract chambers include helical threaded indentation on the exterior of their mouths 36 , which are adapted to engage a complimentary set of threaded indentation on the inner surfaces of the two ends 37 of the center tie piece 14 with a quarter turn . a gasket is used to form a hermetic seal at the junction of the center tie piece 14 and the brew / extract chambers . the center tie piece 14 along with the brew and extract chambers 12 and 15 mounted to its either ends are so designed in order to conform to an hourglass shape . in order to use the apparatus , first fresh coffee grounds are placed in the filter assembly 11 , which is balanced and supported by the leg members 22 . the brew chamber 12 with its associated cap 33 a is inverted and fitted over the filter assembly 11 , sealing in place with the gasket 31 on the filter assembly . the grounds are thereby enclosed . the brew chamber 12 is then inverted so the first cap 33 a is down and the leg members 22 of the filter assembly 11 are facing up . then the brew chamber 12 can be filled with water until the grounds are submerged . the groove 28 channels water into the brew chamber to soak the grounds . one of the ends 37 a of the center tie piece is mounted to the brew chamber 12 , with a quarter turn . the extract chamber is then mounted to an opposite end 37 b of the center tie piece 14 . the apparatus 10 now stands on the brew chamber 12 , particularly on the first cap 33 a attached to the brew chamber 12 , as seen in fig1 . the gaskets prevent leakage after the apparatus is assembled . water soaks into the grounds and starts the cold brew infusion process . the brewing process takes approximately twelve hours . after the brew cycle is complete , the apparatus 10 is inverted and made to stand on the extract chamber 15 , as seen in fig1 . cold brewed coffee extract will drain out of the filter assembly 11 and the brew chamber 12 , and into the extract chamber 15 through the center tie piece 14 . the apparatus 10 takes approximately five minutes to complete this step . after all the extract has drained into the extract chamber 15 , the brew chamber 12 and incorporated filter assembly 11 can be disconnected and the coffee grounds disposed of . the coffee extract is then poured form the carafe assembly into a storage container and can be kept fresh in a refrigerator for up to two weeks . once the coffee has been dispensed , the entire apparatus can be disassembled and cleaned . coffee brewed in the apparatus 10 is a deep rich extract coffee concentrate , and is far less acidic than conventionally brewed coffee . it can be diluted with hot water to a desired taste and strength . to make a typical cup of coffee , two tablespoons of extract are added to 8 oz of hot water . more or less concentrate can be added for desired taste and strength . in one preferred embodiment of the invention , the brew chamber , the extract chamber , and the center tie piece of the apparatus are made of acrylic or polycarbonate material . the features disclosed in this specification , including any accompanying claims , abstract , and drawings , may be replaced by alternative features serving the same , equivalent or similar purpose , unless expressly stated otherwise . thus , unless expressly stated otherwise , each feature disclosed is one example only of a generic series of equivalent or similar features . while specific apparatus has been disclosed in the preceding description , it should be understood that these specifics have been given for the purpose of disclosing the principles of the present invention and that many variations thereof will become apparent to those who are versed in the art . therefore , the scope of the present invention is to be determined by the appended claims . any element in a claim that does not explicitly state “ means for ” performing a specified function , or “ step for ” performing a specific function , is not to be interpreted as a “ means ” or “ step ” clause as specified in 35 u . s . c . § 112 , paragraph 6 . in particular , the use of “ step of ” in the claims herein is not intended to invoke the provisions of 35 u . s . c . § 112 , paragraph 6 .
an hourglass shaped apparatus for cold brewing coffee , comprising a brew chamber , an extract chamber and a center piece connecting the brew and extract chambers . the extract and brew chambers comprise two ends of the hourglass shaped apparatus and the center piece comprises middle portion . the brew chamber houses a free standing self - contained filter assembly containing coffee grounds inside a micro - fine wire mesh . water is poured into the brew chamber to generate coffee extract through cold water infusion . after the brewing process , the apparatus is inverted , and the coffee travels into the extract chamber through the center piece for dispensing . coffee brewed in this manner is less acidic and more flavorful than the conventionally hot - brewed beverage . all the components of the apparatus , the filter assembly , the brew chamber , the extract chamber , and the center tie piece , are detachable .