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US Patent: 25,747
Improvement in methods of combining emery with caoutchouc
Thomas J. Mayall - Roxbury, MA

USPTO Classifications:
264/330, 51/299

Tool Categories:
industrial tools : grinding wheels
metalworking machines : grinders : sharpening machines : grinding wheels


Not known to have been produced

Joseph Gavett
Albert W. Brown

Patent Dates:
Granted: Oct. 11, 1859

Patent Pictures:
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Improvements to patents to the same inventor dated 1859-01-11 and 1859-05-17, which used a mixture of emery, india-rubber, sulphur and olive oil. This new recipe allows the use of a much higher proportion of emery: 15 lb emery, 1 lb rubber or gutta-percha, and 5 oz sulphur. The ingredients are combined and then placed in molds under pressure, then baked. The key innovation here seems to be the pressure.

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