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US Patent: 227,402
Treatment of emery-wheels
Patentee: John F. Wood (exact or similar names) - Boston, MA USPTO Classifications: 51/295, 51/306 Tool Categories: industrial tools : grinding wheels metalworking machines : grinders : sharpening machines : grinding wheels Assignees: None Manufacturer: Union Stone Co. - Boston, MA Witnesses: Francis M. Boutwell George S. Boutwell	Patent Dates: Applied: Dec. 18, 1879 Granted: May 11, 1880 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Union Stone Co.
Description: The invention is a method of waterproofing emery wheels using paraffin, a process necessary for wheels to be used for making paper pulp.

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