Patent US3520091A successfully refreshed from Google Patents.
US3520091A
Expired / Lapsed
US
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Method of grinding the edges of lenses
Assignee: Individual
•
Filing: 1967-08-24
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Granted: 1970-07-14
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Expires: 1987-08-24
Abstract
No abstract record available.
Inventors
- 👤 Osmond Philip Raphael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:21
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/08; B24B9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1145194A
Cited
US1223792A
Cited
US1449266A
Cited
US1929746A
Cited
US2293291A
Cited
US2747337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |