Knickerbocker Co. v. Rogers

61 F. 297 | N.D. Ill. | 1894

GROSSCUP, District Judge.

The complainant claims under letters patent issued to Orville M. Morse, Nos. 403,362, 403,363, 403,770, and 408,987. Claim 2 of letters patent 403,363 is as follows:

“A dust collector, consisting of a tapering separating chamber having an imperforate peripheral wall, in which the whirling body of air forms a vortex, and in which the air moves from the periphery towards the axis of the vortex as it becomes freed from the solid matter; said chamber having at its large end a tangential inlet for the dust-laden air, and a discharge aperture for the purified air opening into 1he atmosphere, and provided witli a tubular guard projecting into the separating chamber, and at its small end a discharge opening for the separated dust, substantially as set forth.”

There was much diversity of view at the hearing as to the mode of operation of this collector. T cannot accept all of the claims urged by counsel for the complainant; not: because they are disproved, but because they are not, satisfactorily proved, and are therefore largely speculative. It seems to me, however, that, the following mode of operation can fairly, and without abstruse speculation, be attributed to the collector: The current of dust-laden air, being blown through the tangential opening into the collector, is projected round the interior of the large end of the cylinder and cone. By reason of the fact that its specific gravity is greater than that of the air, all particles of dust are thrown, by centrifugal force, to the interior walls of the cone, and, circulating spirally down these walls, emerge from the small opening at the lower end of the cone. The air from which the dust has been more or less precipitated is itself subjected to tbe spiral motion and centrifugal force, and also to a degree of condensation greater than tbe outside air, by reason of the inpouring currents through the tangential opening, and therefore, upon reaching the lower edge of the tubular guard, pours upward, round the exterior walls of the guard, to the air without. The effect of the centrifugal force, however, is such that, at the immediate axis of the whirling air, there is a rarification that causes the outward air to pour in, both through the guard, and through the lower opening. What office this plays in the ultimate operation of the collector, I am not able satisfactorily to determine. The net result of the operation is, however, clearly shown to be, that a large percentage of the dust flows through the lower opening, while the air rising through the tubular guard is almost entirely freed of dust. The evidence established, beyond any substantial doubt, that the machine is highly successful, and that no other device of its form, or substantial mode of operation, was ever before employed in the art to which it has been put. '

The defendants deny infringement, and also the novelty and patentability of the Morse invention. It seems clear to me that if claim 2, above quoted, is valid, the defendants’ devices are infringements thereof. With the addition of some immaterial and unnecessary features, these devices are almost the exact counterparts of Morse’s conception. If the efficient purpose of the Morse invention is to precipitate, by means of the tangential entrance, the dust against the interior wall of the cone, and, by means of the spiral rotation, cause it to emerge from the lower opening, while the freed air, moving towards the axis of the vortex, rises through the tubular guard, there can be little doubt but that the defendants’ devices operate according to like tendencies and effects.

I am not satisfied with the testimony that a collector like the Morse invention was in use prior to his invention. Proof of such anticipation, to deprive the inventor of the fruit of his genius, ought to be ,so definite and cogent as to leave in the mind a strong belief that such machine existed. The proof here falls short of that. It leaves my mind in some doubt respecting that alleged fact, but in view of the indefiniteness of the testimony respecting the date of seeing it, and of the improbability that such machine was in successful operation without coming to the knowledge of more observers, located as it was said to have been, this doubt does not rise to the , dignity of a reasonable belief that such machine existed.

The two previous inventions that are urged, with the most empha:sis, as anticipations of the Morse invention, are the Pratt Steam Separator and the Stratton Steam Separator. It will be observed that these were in an entirely different field of the art; but if they disclose a method of separating steam from water, which, by mere mechanical adaptation or change, could be applied to the use of separating dust from air, such fact alone would not foreclose them as anticipations. An examination of these separators, however, shows that before they were readapted, for experimental purposes in this suit, to the uses of dust collectors, they had entirely different relative form and openings. As steam separators, they were practically cylinders, with, enough of a cone, at one end, only to act as a hopper for drainage to the precipitated water; as dust collectors, they are practically cones, being only cylindrical where their interior walls first meet the incoming currents. As steam separators, the openings at each end for the escape of steam and water, respectively, are the same; as dust collectors, the opening for the escape of the freed air is many times larger than that for the dnst. As steam separators, the action of the spiral cuiTents is not affected by, or adapted to, the influence of immediate contact with the outside atmosphere; as dust, collectors, the size of the openings, and the arrangement of the tubular guard, show that such adaptation is one of the essential features of its separation. I have been unable to ascertain definitely why these steam separators, in their original form, and with the original openings, might not be adapted to the purposes of collecting dust; but the fact nevertheless remains that, for some practical reasons, they are not Otherwise, why should their proportions and openings be disturbed, and essentially rearranged to such, close approximation to the Morse invention. It is evident that this readaptation, this decided change of form, was essential to success in their changed use. The reason for the chauge may be occult, but the effect of the change is unquestioned; and in my judgment, an inventor ought not to be deprived of the fruit of Ms invention, where it has brought a new device into successful operation, simply because the physical laws upon which it operates are not susceptible of satisfactory exposition. The essence of the Morse invention is in so changing the form of all preceding machines and devices that, when used in dnst collecting, it successfully precipitates nearly all the dust through the lower opening, and leaves the freed air to rise through the upper. It is not, in that respect, a mere change of form of an old device, such as is usually regarded as mechanical only. The essence of the invenlion is in the particular form adopted. Neither the form, nor relativity of openings, of former devices, would perform the office required. Other forms, such as the originals of the steam separators, will collect a large portion of the dust from the air; but such is not a successful and accomplished dust collector. A dust collector must approximately collect all the dust, or it is not a dust collector. The evidence in this case shows that Morse was the first who, either through experiment, happy accident, or knowledge of the abstruse force of physical laws, hit upon the light form of cone and tubular guard, and relative size of upper and lower openings, in connection with a tangential inlet; to constitute a successful dust collector of that character.

The complainant claims that claims 1, 2, and 3 of patent No. 403,362, claims 1 and 2 of patent No. 403,363, claim 4 of patent No. 403,770, and claims 1 and 2 of patent No. 408,987, have been infringed by the defendants, and are valid; and the court so finds, but construes all those claims as calling, either expressly or by implication, for a tapering separating chamber. For the foregoing reasons the finding will be for the complainant, and an injunction issue accordingly.