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US2936673A
Expired / Lapsed
US
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Polarizing optical systems
Assignee: American Optical Corp
•
Filing: 1956-01-24
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Granted: 1960-05-17
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Expires: 1976-01-24
Abstract
No abstract record available.
Inventors
- 👤 Hyde Walter Lewis
- 👤 Inoue Shinya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:21
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/0004; G02B21/0092
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2303906A
Cited
GB626621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |