Patent US2428412A successfully refreshed from Google Patents.
US2428412A
Expired / Lapsed
US
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Means for unblocking lenses
Assignee: American Optical Corp
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Filing: 1942-02-13
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Granted: 1947-10-07
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Expires: 1962-02-13
Abstract
No abstract record available.
Inventors
- 👤 Dodkin Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:32
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005; B24B13/0057
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1712701A
Cited
US2078129A
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US1845850A
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US1840619A
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US1959994A
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US1978204A
Cited
US2038592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |