No. 3397 | 3rd Cir. | Dec 6, 1926
This case concerns the making of brick and hollow tile from “red dog,” .a by-product of bituminous coal mining. In such operation great quantities of slate and other strata near the coal have to be mined in connection with the coal, by reason of the thinness of the coal vein. This worthless substance is dumped in huge piles near the pit mouth, where it often takes fire by spontaneous combustion and the burning produces a substance, equally worthless, which the miners call “red dog.” The proofs in the ease show that some of this red dog was sent to one Engelbr'eeht, whose patent is here involved, with a view to ascertaining whether it could be used in making fireproof bricks. He experimented and found that, when used in proper proportions with Portland cement, it could be made into bricks having very desirable qualities, and he made some sample bricks by the use of such ingredients. He also found it was possible to< use imslacked lime as a binder and he made bricks of those ingredients.
After thus demonstrating the practical possibility of each of the binders, viz. Portland cement and unslaeked lime, he, on May 25, 1921, made application for, and on July 24, 1923, was granted, patent No. 1,462,596 for slate bricks. Why he did so is inexplicable but for some reason he made no disclosure in his specification that Portland cement could be used as a binder, but confined his disclosure to the use of unslaeked lime. His specification made no suggestion of the use of any other binder than unslaeked lime, and his claims were limited, respectively, to unslaeked lime, viz. “a proportionately small amount of unslaeked lime,” and “from 3 to 5 per cent, of unslaeked lime.” The disclosure of his specification was that after describing red dog, the proportions to be used and preliminary grinding thereof were as follows: “I then add a small proportion of unslaeked lime, in the neighborhood of from 3 to 5 per cent.; the greater the percentage of lime, the stronger the brick;” and “my invention consists in part in grinding this mixture properly, the object being to much more thoroughly mix the substances by grinding in conjunction with < the proper amount of water, so as to cement together with the lime as great a surface area of the grains of slate as is possible, thereby making the brick stronger and less liable to be disintegrated by intense heat. * * * The grinding, however, is carried on while the mixture is still moist and the lime is slacking, and it is continued until a coherent mass is formed, which will not crumble apart when pressed together.”
It will thus be seen the case is not one where, for example, an inventor had found a
In view of the full knowledge of Engelbrecht of the use of such cement, and his making neither disclosure nor claim of it, there was no basis for a reissue on the ground of “inadvertence, accident, or mistake,” so as to then disclose and elaim cement as a binder, and thereby make infringers of cement users, such as the defendant, who were not so when Engelbrecht’s patent was issued. Oh the contrary, the case is one where, with full knowledge of the use of Portland cement in connection with “red dog,” Engelbrecht saw fit not to disclose such demonstrated use, and asked for claims limited to his disclosure of lime as a binder. Under such facts, his patent rights were limited to what his original disclosure showed, and the subsequent enlargement of his specification and addition of claims, in his reissue No. 15,829, so as to cover Portland cement, must be adjudged unwarranted and invalid.
So holding, the decree of the court below, dismissing the plaintiff’s bill, is affirmed.