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US Patent: 100,944
Improvement in the manufacture of cement for artificial stone
Material for making grinding wheels
Stanislas Sorrel - Paris, France

USPTO Classifications:
106/645, 106/685, 106/687

Tool Categories:


Union Stone Co. - Boston, MA

F. Olcott
J. U. Zust

Patent Dates:
Granted: Mar. 15, 1870

Patent Pictures:
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"Vintage Machinery" entry for Union Stone Co.
This is an improvement on patent 53,092. The improvement is a method of using magnesite rather than the previously-used manufactured magnesia that was derived from magnesian limestone or dolomite. "Large deposits of magnesia have been recently discovered in the United States, both east and west, and it can be used in many places with economy for my purposes."

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