Patent US2545447A successfully refreshed from Google Patents.
US2545447A
Expired / Lapsed
US
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Apparatus for grinding lenses
Assignee: GEN OPTICAL Co Inc
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Filing: 1947-06-27
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Granted: 1951-03-20
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Expires: 1967-06-27
Abstract
No abstract record available.
Inventors
- 👤 George A Clement
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:33
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005; Y; Y10; Y10T; Y10T279/00; Y10T279/18; Y10T82/00; Y10T82/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US978764A
Cited
US1224169A
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US1260022A
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US1274591A
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US1282037A
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US1436626A
Cited
US1467308A
Cited
US2096751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-19 | 1954-09-18 | 1955-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-19 | 1958-09-18 | 1959-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-19 | 1962-09-18 | 1963-03-20 | $7700.00 | Window Closed / Lapsed |