Paynter v. Devlin
63 F. 122 | U.S. Circuit Court for the District of Eastern Pennsylvania | 1894
The suit is for infringement of claim 1 of letters patent issued to E. P. Paynter, Jr., for steam-pipe "unions,” numbered 367,725, dated August, 1887.
The claim reads as íoIIoavs:
“A union for steam pipes, comprising a threaded ring or nut, a. member having a scat of soft metal with a concave face, and a.n opposite member with a rounded or convex end, substantially as shown and described.”
The validity of the patent and the charge of infringement are denied.
The plaintiffs’ expert. Mr. Brown, has described the state of the art, and the invention claimed, so satisfactorily, that we will adopt what he has.said on this subject:
“l'he invention of the patent in suit relates to what is known in the art as a ‘union’ for pipes. The purpose of a union is to join together the adjacent ends of two pipes through which steam, water or other gases or liquids are 1o traverse. The purpose of the union, besides joining together the ends of the pipes, is also to render the joint gas and liquid tight under all contingencies. The union npon which the invention of the patent in suit is an improvement consists of three piirts, as follows: Mrst, a head member, which is constructed to be screwed upon or otherwise attached to the end of one pipe; second, a tail member, which is constructed to be screwed or otherwise attached to the second pipe; and, third, a ring or nut which fastens the tail and head members together. This fastening ring or nut is slipped over either the tail member or the pipe to which said tail member is secured, and it joins the two members together by screwing upon the head member and drawing the ttvo members tightly together by means of a flange forming part of the ring or nut which’ abuts against a flange of the tail member. When the tail and head members are thus drawn together by means of the fastening ring or nut, their respective ends are brought into contact with each other, and the perfectness and tightness of this contact determines the character of the joint thus madei If tills contact is entirely perfect throughout its entire extent, then the joint would under ordinary circumstances bo gas and liquid tight, so that no leakage would occur. An imperfection in the perfectness of the contact, however, would result in leakage. The utility, therefore, of a union of this character depends upon tlie character of the joint which is formed between the abutting ends of the head and tail members. Unions of this character are not intended to be permanent coupling devices between the pipes which they connect, but they are employed in cases where it may be from time to time necessary or desirable to disconnect the pipes which the union joins. Consequently, if the union is to possess merchantable utility, it must be one which will not only make a gas and liquid tight joint when put together for the first time, but it must also maintain tiie perfectness of the joint when repeatedly fastened and unfastened.*124 Obviously this renders tbe maintenance of a perfectly tight joint a matter of difficulty as well as of importance. Prior to the date of the patent in suit a large number of expedients had been devised for the purpose of maintaining a gas and liquid joint in union. As far as I am aware, however, only two of these expedients have met with any general acceptance and adoxDtion, and in order to explain the improvement introduced by the patent in suit it will be sufficient, I believe, to refer to these two widely adopted expedients.
“The first of these expedients to which I shall refer was to make the abutting ends of the two members of the union of hard metal and to grind them to exact trueness, so that when the two members were forced into contact their two abutting faces should exactly fit together. Several serious objections, "however, exist in a union thus made. In the first xdace, it is a matter of considerable difficulty and one requiring considerable skill to thus grind the two abutting faces so that they shall fit with exact trueness. As a consequence a union thus made is expensive. Practically, also, it is impossible to secure the exact' longitudinal axial alignment of the two pipes which are joined together. Ordinary xfipcs, such as are usually employed for the conveyance of gases and liquids, are roughly and economically made, so that they are rarely perfectly straight, and as the result the longitudinal axial alignment of two such pipes is difficult to secure. The result is that when the tail and head members of the union , are placed upon the adjacent ends of two pixies, they are rarely exactly opposite to each other with their adjacent faces exactly parallel. The result is that when the two members of the union are brought tightly together by the action of the fastening ring or nut, contact is not made throughout the entire extent of the abutting faces of the two members of the union. The result is that one of two things usually happens; either a perfectly gas and liquid tight joint is not secured, or if it is seemed, for the time being it is only done so by the partial indentation of the face of one member of the union into the face of the other member of the union at the xilace where the two members of the union first come into contact. The result of this indentation destroys the further utility of the union if the pipes are disconnected and it'is sought to again use the union, since it is practically imxiossiblo to insure the two members so coming together again the second time under the xirecise conditions which existed when they were first brought together and so that the imperfection caused in the face of one member .shall exactly coincide with the corresponding imperfection in the opposing member. In this connection, also, attention may bb called to the fact that it is the usual practice of those who put up pipes to first place the pipes in position, and to then apply the union. In order to thus apply the union it is necessary to spring in succession the adjacent ends of the two pixies out of alignment in order to secure the members of the union to the ends of the iiixics, and this springing the ends of the pipes out of alignment adds to the practical difficulty of securing the exact longitudinal axial alignment of the two pipes when the two members of the union are forced together by the fastening ring or nut. I might also add at this point that the fastening ring or nut fits loosely over the tail member of the union, so that it is possible to screw the same tightly upon the head member of the union without bringing the abutting faces of the two members of the union into contact throughout their entire extent, so that where ground faces are relied upon to render the joint tight the application of very great force to the fastening nut or ring is frequently necessary.
“In order to avoid and overcome the objections to ground faces which I have mentioned, the second expedient to which I have alluded has been resorted to. This second expedient consists in interposing between the abutting íacés of the two members of- the union, washers or gaskets of rubber, leather or fibrous material. Such washers or gaskets compensate for irregularities which may exist upon the abutting faces of the two members of the union, and also for variations from exact alignment of the pipes. New difficulties, however, result from the employment of such washers or gaskets. In the first place, the presence of a washer or gasket in a un-ion doubles the number of joints to be kept tight. Instead of there being only one joint between the abutting faces of the two members of the union there are two joints introduced; that is to say,-one between the annular washer and the tail member,*125 and a second joint between tlie annular washer and 1lie head member of tlie ■union. In tlie next place, frequent fastening and unfastening of the union results in destroying the elasticity of the washer or gasket, and rendering it hard and incapable of conforming to irregularities in tlie abutting faces of the members of the union, the result of which is a leaky joint. In the next place, if a washer is employed having rubber in its composition 1he heat of tlie steam, if steam is passed through the pipes, destroys the integrity of the washer. In ilie next place, such washers or gaskets deteriorate rapidly under Tlie action of the liquids or gases which traverse the .pipes. This is particularly the case in some instances, as, for example, where ammonia gas or an ammonia cal liquid traverses the pipes. And, again, since these washers or gaskets are necessarily elastic, they are frequently expanded inwardly by the compression which they undergo so as to partially obstruct or throttle the internal passage through the union, thus interfering with the proper passage of the liquid gases.
“The improvement introduced by the patent in suit is designed to overcome all of the difficulties which I have alluded to, and in my opinion the patented improvements are exceedingly effective in accomplishing their objects. The union of the patent in suit comprises, as is usual, head and tail members, and a fastening ring or nut. On referring to the drawing of tlie patent in suit, it will be seen that the head member is lettered A, the tail is lettered C, and tlie fastening ring or nut is lettered B. The improvement consists in the relative construction of the abutting faces of the two member's of the union in a union of this character. One of the members of llie union lias its abutting end made convex, and the other member lias its corresponding abutting face made concave, so that when these two abutting ends are brought together a joint analogous to a ball and socket joint is produced. As the result of this construction the abutting faces of tlie two members are brought exactly together, even if the two pipes to which they are attached are not, in alignment. Also the abutting face, of one member of the union is made of soft metal, while the abutting face of the other member of the union is of hard metal. As tlie result of tlie employment of soft, metal for one face of oiie member, when the two members are brought together the soft metal yields sufficiently to accommodate itself to any irregularity which may exist in the abutting face of the opposing member. The soft metal which is employed may be lead or any of ¡ho well-known soft alloys, which are usually composed of lead, tin and antimony. Tlie hard metal constituting the opposing face is conveniently and usually the metal of which the union is composed, such as malleable iron, which is the material commonly employed. The soft metal which is employed may be regarded as taking the place of the old annular gasket or washer, but it has conspicuous and marked advantages over such gaskets or washers. In the first place, this soft metal face can be permanently secured to one member of the union so that it is always In place when needed, and so that no joint susceptible of possible leakage is formal between it and the member to which it is secured.
“Again, the soft metal does not deteriorate under tlie action of such liquids or gases which are conveyed through the pipes. And still, again, It is always ready to accommodate itself to irregularities in the face of the opposing member, irrespective of any variation in the position thereof.
“In the particular embodiment of the invention which Is illustrated in the patent in suit, the head member of the union, which in the patent is called the female member and is lettered A, is the member which is provided with a concave abutting face, and this concave face is furnished with or formed of the soft metal which is lettered I). And the tail member of the union, which is called in the patent the male member and is lettered 0, is'provided witli the convex end or abutting face, which is of hard metal.”
The proceedings in the patent office show that the letters were granted after a careful examination of the state of the art, in which nearly everything urged here was considered. Without entering upon a discussion of the subject, it is sufficient to say that we have not found anything which repels the presumption arising from these proceedings.
■ The defendants’ manufacture, complained of, is not materially different. It is a combination of the same elements, for the same use, and accomplishes the same result. It shows immaterial mechanical differences, but nothing more. As we have seen, the plaintiffs’ consists of a head piece with convex exterior surface of hard metal, a tail piece with interior concave surface of soft metal, and a coupling nut. The defendants’ has a head piece with convex face of soft metal, and a tail piece with concave face of hard metal, and the coupling nut. The only difference consists in a slight transposition of parts, and is immaterial in any possible construction of the claim.
The defendants’ effort to justify their conduct under a subsequent patent, which they own, is unavailing; and would be if their manufacture was covered by this patent. But we think it is not so covered, that the patent describes and claims an essentially different device.
Let a decree be prepared in favor of the complainants accordingly.