US Patent: 18,509
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| Grinding and polishing metal
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Patentees:
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| Daniel Lovejoy (exact or similar names) - Lowell, MA |
| George F. Butterfield (exact or similar names) - Lowell, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Oct. 27, 1857 |
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Jeff Joslin
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Description: |
| The 1871 "Decisions of the Commissioner of Patents" reports that an application for extension of this patent was granted. The decision reads, in part, "The patented machine was designed for finishing up the face of a knife for a planing-machine, so as to give it a perfectly plane and true surface, a thing exceedingly difficult, if not entirely impracticable, to accomplish by hand. The desired result is attained by causing the article which is to be faced to reciprocate at the same time both vertically and horizontally in a plane tangential to the face of the revolving grinding surface... "The invention has been used by the patentees only in the building up and improvement of their own business, and in the prosecution of this it has been found necessary to keep but a single machine in operation. Up to 1860 the inventors appear to have been working in partnership. At this time Butterfield sold out his interest in the patent for the balance of the term for $500." The applicants calculated that the patented machine had netted them an additional $9,450 over the life of the patent. The commissioner found that this was insufficient benefit and an extension was awarded. |
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