What we claim, therefore, as our invention, and desire to secure by letters patent, is—
1st. Producing a shoe-sole, or other analogous manufacture, in India-rubber or gutta-percha, in one piece, having a variety of thicknesses in its different parts, by the use of rollers whose surfaces present the reverse of the forms to be produced, at a single operation, substantially as herein described.
2d. Forming soling of India-rubber or gutta-percha, with shanks, fore-parts, and heels of appropriated differences of thickness in one solid piece, at one operation, as described—thus producing a useful, economical, and novel manufacture.
3d. Also, forming such solings, or analogous manufacture, in continuous sheets, at one operation, by rolling, as described.
Eighty-fourth, to Charles Goodyear, of New Haven, Conn. For improvement in treating vulcanizable gums. Patented April 4, 1854. The improvement and claims consist in the method of manufacturing compounds of caoutchouc, gutta percha, and other gums susceptible of vulcanization, in sheets, by covering the surface or surfaces of the sheets of gum with sheets of paper or cloth, or the equivalent thereof, and then confining the same during the process of vulcanization, by pressure between plates of metal or their equivalents, or otherwise, substantially as described. No illustration.
Eighty-fifth, to Julius Herriet, October 24, 1854. For improvement in gutta-percha Stereotype Composition.
Equal parts, by weight, of gutta-percha or caoutchouc, and pulverized graphite, or soapstone, or plaster of Paris, or chloride of lime, or peroxide of manganese, or other equivalent, are mixed together, heated, and moulded while hot. The proportions may be varied to suit the desired softness or toughness of the mass. The alleged qualities of the composition are plasticity, sufficient hardness to present sharp-angle lines and yet to resist pressure, aptness to be remoulded, and cheapness.
Claim.—The making of moulds and plates, for printing characters or figures, of gutta-percha or India-rubber, compounded with some other substance, substantially such, and for the purposes as described.
Eighty-sixth, to Henry Forstrick, Hoboken, N. J. For working over vulcanized India-rubber.
I claim the manner of extracting inorganic matter from vulcanized India-rubber, gutta-percha, and other gums or their compounds, by the application of diluted nitric acid and the use of fusel oil (grain oil) either in a heated state, mixed with the gum, or in the shape of vapors, for the restoration of the cleansed gums to the state of cohesion.