US2472731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One-piece channeled lens mounting
Assignee: American Optical Corp
•
Filing: 1944-12-15
•
Granted: 1949-06-07
•
Expires: 1964-12-15
Abstract
No abstract record available.
Inventors
- 👤 Edward M Splaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:10
CPC Classifications
G; G02; G02C; G02C1/00; G02C1/04; G02C7/00; G02C7/10; G02C7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1238396A
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US1544925A
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US1805396A
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US1899905A
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US2192092A
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US2187810A
Cited
US2191937A
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US2179286A
Cited
US2172959A
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US2337617A
Cited
US2397243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |