Samuel Blatchford

“ It is a declaration that that which is not claimed is either not the patentee's invention, or, if his, he dedicates it to the public.'
In Mahn v. Harwood, 112 U.S. 354, 360, 361, 5 Sup. Ct. Rep. 178, it is said: 'The taking out of a patent which has (as the law requires it to have) a specific claim is notice to all the world, of the most public and solemn kind, that all those parts of the art, machine, or manufacture set out and described in the specification, and not embraced in such specific claim, are not claimed by the patentee,-at least, not claimed in and by that patent. ”

“ Some coloring substances may likewise be used without any medium or vehicle.'
In the English patent granted to Charles Swan and George Frederick Swan in February, 1856, a black coloring matter is described, applicable to the purposes of writing, dying, or staining; and it is said that the inventors employ an extract of logwood, treated with bichromate of potash or with perchloride of mercury, subcarbonate of potash, chlorate of potash, and spirits of ammonia ”

“ After the solution has been filtered the precipitate is removed from the filtering device and dried. The precipitate is then mixed with lard oil and wax, or their equivalents, and the mixture is then ground together in a warm state.
'The dye solutions we prefer to employ are obtained from logwood or haematoxylin, the active principle of logwood, Brazil wood, sapan wood, peach wood, madder, or its active principle, alizarine. ”