Mr,. Justice Strong
delivered the opinion of the court.
Among the defences set up in the answer of the defendants is one that strikes at the validity of the reissue of the Ball patent. It.is insisted that the reissue is not for the same invention as- that for which- the original patent was granted, but is " for more and other matters and things than those of which he- was the original and first inventor, and more than were described or included in the specification attached to said original patent granted to him, or shown in the drawing attached, thereto, or in the model forming part of the application for said patent."
It is. hardly necessary to say that, if the reissue is, in fact, what the answer alleges it to. be, if it is not for the same invention as that described or shown in the specification of" the original patent, or in the drawings or model accompanying it, and- if this clearly appears from a comparison of the two patents, the original and the reissue, then the reissue is invalid. The question is not a new one in this court. It was before us in the recent case of Ball v. Langles (supra, p. 128), in which we held the reissue to be void. We expressed our opinion in that ease that in the original specification, drawing, or model of Ball's patent there was no hint of .conducting the products of combustion from a fire-chamber under or below an oven directly into or through the baking-chamber, but that what was claimed or exhibited- was. conducting the heat or other products of combustion into flues leading from the fire-chamber, and exterior to the baking-chamber, towards the chimney, and permitting no access to the interior chamber, or the oven, except through perforations in its side or back walls. By that arrangement the oven -was principally heated by radiation from its sides, and not at all by radiation directly from the fire-chamber. But the reissue was for a very different, arrangement. It claimed an invention for passing the heat or products of combustion directly from the fire-chamber into the oven, not by any circuitous route, but immediately through apertures in the bottom off the oven, as well as indirectly through perforations in the' side flues. This we regarded as radically different from the original invention, as new matter, for which the reissue was unauthorized. "We have seen in this case no reason for changing the opinion. The Ball reissue, therefore, is held to be invalid, and its further consideration may be dismissed from the case.
We pass, then, to a consideration .of the McKenzie patent, •the only one that confers any rights upon the complainant. The original was, as we • have seen, granted on the first day of May, 1860. There have been two reissues, the first granted April 19, 1870, and the second April 20, Í875,. after an extension had been allowed.
The invention, as described in the patent, consists,. first, in the combination in an oven for baking bread and other substances, of. the following elements: "A furnace or fireplace, one or more,, a baking-chamber arranged above such furnace or fireplace, and in direct communication therewith, and a rotating reel located within said baking-chamber, and provided' With gravitating pans or shelves arranged or hung around the shaft of said reel from rods attached to the end plates or arms thereof," by which, as the specification declares, the patentee produced a " continuously baking oven, in which the bread or other substances are subjected to the direct action of the gaseous products of combustion, ascending from the lower portion or bottom of the' oven." Second, " in an arrangement of flues' or openings communicating from the. "'fireplace or fireplaces with the baking-chámber,' directly through the floor of the latter; " and, third, " in certain combinations and arrangements of exit flues . . . for securing a proper circulation of- the gaseous products of combustion through the oven om baking-chamber, both when baking and lighting the fire." Having thus stated generally the nature and object of his invention, the patentee, proceeded to describe the construction and arrangements by which the oven is. heated. From the back of each furnace or fire-place a flue is constructed extending horizontally to the rear wall of the oven. From the fireplaces and along thos? flues -a series of openings is made through the floor of 'the oven, communicating with its interior. Between the two furnaces and extending from the front to the rear of the Oven, directly under the floor, another flue is constructed communicating with a vertical flue at the rear of the oven, which leads to the chimney. In this latter horizontal flue there are openings into the baking-chamber at its front and rear, which may be closed by valves operated from the front. This flue is the exit-flue by means of which the gaseous- products of combustion escape from the oven through the. valvular openings.1 In the centre of the top of the oven there is also a .valvular opening, communicating by a horizontal flue with the vertical flue that leads to the chimney, which is also an exit for the products of combustion. Having thus described the arrangements for heating the oven, the specification next proceeds to set forth the arrangements for the reel with its gravitating pans or shelves. These it is unnecessary to notice particularly.
The specification claims five combinations, the first of which only is charged to have been infringed by the defendants. It is as follows: " The combination of the following elements, to wit, a furnace or fireplace (one, or more), a baking-chamber arranged above such furnace or fireplace, and in direct com munieation therewith, and a rotating reel located within said baking-chamber and provided with gravitating pans or shelves arranged or hung around the shaft of said reel from rods attached to the end plates or arms thereof, substantially as and for the purpose described."
To determine accurately the extent of the invention secured by this patent, the state of the art at the time when the original patent was granted (May 1, 1860) must be considered. Before that time, ovens were well known, and they had been constructed with a baking-chamber, a. fireplace' or furnace (one or more) arranged immediately under the chamber, and with a rotating reel located within the chamber, and revolving around a horizontal shaft, the reel provided with gravitating shelves or pans suspended on rods attached to its arms. Some of these ovens were arranged so -that a portion of the heated products of combustion should pass into and through the baking-chamber, though indirectly by a circuitous route; Such was the Carrot oven patented in France in 1840, and notably the oven patented to Hosea Ball in 1856. And the Jennison oven, in use in the spring of 1859, and patented Feb. 1, 1859, was constructed so as to admit the products of combustion directly from the fire or furnace into the baking-chamber. It is obvious, therefore, that if the McKenzie patent can be sustained at all, it must receive a very limited- construction. The element of the combination which, relates to the communication between the furnace or fireplace and' the interior of the oven, must be restricted to the peculiar structural arrangement by which the products of combustion are admitted- into the baking-chamber.
They are admitted, as' we have seen, through openings in the arch or top of the furnace, and' through the floor of the oven, along the flues extending rearward from the furnace to the back part of the oven. But the. oven has' a floor which separates it from the fire-chamber. The communication with the baking-chamber is by means of flues, short it may be, but admitting the products of combustion into the baking-chamber only at intervals, and always near the side. Manifestly neither such' an arrangement, nor anything equivalent to it, is found in the defendants' ovens. In them the bottom of the baking- chamber is" not separated by any partition.' or diaphragm from the fire-chamber or furnace, and there are. no flues, to conduct the generated heat into the chamber. The charge of infringement is, therefore, not sustained.
Decree affirmed.