Forty-ninth, to Richard Solis, November 7, 1848. For a mode of preparing the cloth for the rubber by stretching, also placing the rubber on the cloth obliquely.
Fiftieth, to H. G. Tyer and John G. Helm, January 30, 1849. For improvement in the manufacture of India-rubber. We here disclaim the use of rubber and sulphur alone, as also the submitting of rubber, or rubber compounds to a high degree of heat, patents having been granted for that process, in this and other countries; neither do we wish to secure the right of coloring rubber, such having frequently been done by rubber manufacturers.
But what we do claim and wish to secure by letters patent, is the combination of caoutchouc in its several varieties, with either carbonate of zinc, sulphate of zinc, or the other salts of zinc with sulphur, in manner, form and proportion as hereinbefore set forth.
Fifty-first, to H. G. Tyer and John G. Helm, Aug. 7, 1849. Re-issue. For improvement in the manufacture of India-rubber goods by means of zinc compounds.
We here disclaim the use of rubber and sulphur alone, as also the submitting of rubber or rubber compounds to a high degree of heat; neither do we wish to secure the right of coloring rubber, such having frequently been done by rubber manufacturers.
But what we do claim as our invention, and desire to secure by letters patent, is India-rubber fabrics made by the combination of caoutchouc in its several varieties, with zinc compounds, in their various forms, as herein set forth, and sulphur; and in combination with these, the submitting our compound to the action of a high degree of heat; the whole being combined and manufactured substantially as above described.
Fifty-second, to Nelson Goodyear, Oct. 16, 1849. For improvement in elastic cords for suspenders. I do not claim simply covering threads of metallic or vulcanized rubber with braid, as this has long since been done, but not whilst the India-rubber is in a state of tension; nor do I claim simply combining non-elastic cords with the button-hole pieces, and with the shoulder straps of suspenders, by passing such cords through loops or around rollers attached to the shoulder straps, as this has also been long known; but—
What I claim as my invention, and desire to secure by letters patent, is the making of elastic cords for suspenders, by braiding or winding silk, cotton, or other threads, around cords of metallic or vulcanized India-rubber, whilst in a partially distended state, substantially as described, whereby springs of greater resisting force are produced, than by any other known plan.
Fifty-third and fifty-fourth, to Charles Goodyear—re-issued—Dec. 25, 1849. For improvement in processes for the manufacture of India-rubber. What I claim as my invention, and desire to secure by letters patent, is the curing of caoutchouc or India-rubber, by subjecting it to the action of a high degree of artificial heat, substantially as herein described, and for the purpose specified.
And I also claim the preparing and curing the compound of India-rubber, sulphur, and a carbonate or other salt or oxide of lead, by subjecting the same to the action of artificial heat, substantially as herein described.