_Forty-fourth_, to Horace H. Day, and Francis D. Hayward, of New Brunswick, N. J., May 7, 1848, re-issued November 7, 1848. For forming and rendering elastic suspenders, shoulder braces, riding belts, and other similar articles, by use in combination therewith of the elastic rings, for the purpose of giving spring and draught. _Forty-fifth_, to Henry Bewley, Dublin, Ireland, May 23, 1848. For application of gutta-percha in any of the states, and by any of the processes before specified, to the manufacture of flexible syringes, tubes, bottles, hose, or other like vehicles or vessels, or to the improvement of such articles after manufacture. _Forty-sixth_, to Charles Hancock, Grosvenor Place, London, May 23, 1848. For a method of making bands and belts of gutta-percha, or the compounds thereof, by the process of forming, in combination with the process of stretching or drawing out, substantially as described; and this I claim irrespective of the methods that may be employed for forming and stretching, or drawing out the bands or belts. _Forty-seventh_, to R. A. Brooman, London, England, May 23, 1848. For manufacture of various articles, by moulding, stamping, or embossing, &c., to give to such articles the form required to be retained, whether useful or ornamental, whereby I am enabled to produce articles useful or ornamental, or both, at less cost, more durable, more easily applied, and in short, more valuable than when made of any other known substance; and this I claim, whether made of gutta-percha alone, or in combination with such other substances as are herein specified. _Forty-eighth_, to Charles Keene, Sussex Place, Regent’s Park, England, May 23, 1848. For the manufacture of boots, shoes, and other articles of any known kind of cloth or leather, lined or coated, as herein described, with gutta-percha in any of the states of preparation or combination, by cementing instead of sewing or stitching them together. _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.