Patent DE2244677B1 successfully refreshed from Google Patents.
US2475921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glare reduction filter comprising light polarizing area merging gradually with transparent nonpolarizing area
Assignee: Polaroid Corp
•
Filing: 1940-06-26
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Granted: 1949-07-12
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Expires: 1960-06-26
Abstract
No abstract record available.
Inventors
- 👤 Robert A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:38
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1224530A
Cited
US1257541A
Cited
US2087795A
Cited
US1610124A
Cited
US1872553A
Cited
US1805969A
Cited
US2031045A
Cited
US2008347A
Cited
US2017705A
Cited
US2051327A
Cited
US2209435A
Cited
GB476023A
Cited
US2102632A
Cited
US2168220A
Cited
GB496329A
Cited
US2185018A
Cited
US2169022A
Cited
US2329543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-11 | 1953-01-10 | 1953-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-11 | 1957-01-10 | 1957-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-11 | 1961-01-10 | 1961-07-12 | $7700.00 | Window Closed / Lapsed |