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Patent number:
Patent Date:
US Patent: 441,570
Lens Grinding Machine
Patentee:
Richard B. H. Leighton (
exact
or
similar
names) - Philadelphia, PA
USPTO Classifications:
142/1
,
451/123
,
451/227
,
451/277
,
451/294
,
451/42
Tool Categories:
specialty machines
:
material grinding machines
Assignees:
None
Manufacturer:
Not known to have been produced
Witnesses:
Unknown
Patent Dates:
Applied:
Mar. 06, 1890
Granted:
Nov. 25, 1890
Patent Pictures:
USPTO
(New site tip)
Google Patents
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