US2471871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work support for lens drilling machines
Assignee: American Optical Corp
•
Filing: 1944-08-07
•
Granted: 1949-05-31
•
Expires: 1964-08-07
Abstract
No abstract record available.
Inventors
- 👤 Charles T Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:35
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/14; B28D1/143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US319748A
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US380130A
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US603025A
Cited
US1222559A
Cited
US1370035A
Cited
US1801222A
Cited
US2222538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |