The nature of this invention consists in the process of preparing and using compositions made by grinding metals, earths, and other similar materials, with the raw uncured gums of gutta-percha and caoutchouc (India-rubber.)
Also claims—The making of stereotype moulds, and plates of the raw uncured gum, combined with the pulverized oxides of iron and antimony, or other equivalents.
Seventy-first, to Richard Solis, of New Brunswick, N. J., February, 1853. For India-rubber. I claim the manufacture of India-rubber fabrics by the mixture of ground or powdered vulcanized rubber, with the ordinary India-rubber of commerce.
Seventy-second, to Charles Goodyear, New York, April 12, 1853. For improvement in manufacturing articles composed of gutta-percha.
This invention consists in using or employing sand, pulverized soapstone, plaster, or some similar granular or pulverized or porous matter, or moulds made of porous substances, to sustain and keep the form of moulded or modelled article composed of caoutchouc or its compounds, and other gums, during the process of vulcanization, in proper shape and form. The caoutchouc or other gums are taken in a green state, and formed into the exact shapes desired, then covered with pulverized soapstone, or other similar granular or adhesive powder; they are placed in a box and heated to 200° or 300° Fahrenheit, from three to seven hours when the articles are vulcanized.
Seventy-third, to Charles Goodyear, and Robert Haering, of New Haven, Conn., April 12, 1853. (Assigners to Charles Goodyear.) Patented in England, March 4, 1851. For manufacturing India-rubber and gutta-percha.
The art or method of manufacturing articles composed in part of caoutchouc, or other gums, susceptible of vulcanization, by heating or vulcanizing the same, when surrounded with and pressed upon, externally or internally by or moulded in pulverized soapstone, sand, plaster, or other similar granular, pulverized or porous matter, or in moulds of plaster or other porous substance, as described.
Seventy-fourth, to John L. Kingsley, New York, June 14, 1853. For improvement in moulding gutta-percha Stereotype Plates.
The nature of this invention consists in making moulds for stereotyping of India-rubber, or gutta-percha, by mixing the gums with the metallic or earthy substances, and by expelling all air from the mould while it is being filled, to render the cast in all respects perfect. (The process would require too lengthy a description for this report.) The “claim” is the process of expelling air from the surface of the type when forming the mould, and from the surface of the mould when forming the plate. Also the method of dressing, levelling, or thickening the moulds and plates, when made of any compounds that run, so that all plates made shall be invariably of the same thickness.
Seventy-fifth, to Lenardo Westbrook, of New York City, July 19, 1853. For Gutta-percha Stereotype Composition. An improvement on the patent of Josiah Warren, dated April 25, 1846, first, the compound described, of shellac, plumbago or graphite, asphaltum and gutta-percha, treated by sulphate of copper and water, as described, as a substitute for type metal.