Patent US2531956A successfully refreshed from Google Patents.
US2531956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical lens system
Assignee: Individual
•
Filing: 1945-08-29
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Granted: 1950-11-28
•
Expires: 1965-08-29
Abstract
No abstract record available.
Inventors
- 👤 Waldorf Adrian
- 👤 Willard H Wade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:10
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US494128A
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US1101686A
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US1270336A
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US1501979A
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US1843663A
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US2006509A
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US2172775A
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GB467995A
Cited
US2229302A
Cited
US2296943A
Cited
US2307211A
Cited
US2298808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |