US2991639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault finder
Assignee: Meiners Optical Devices Ltd
•
Filing: 1957-12-11
•
Granted: 1961-07-11
•
Expires: 1977-12-11
Abstract
No abstract record available.
Inventors
- 👤 Meiners Carl Otto
- 👤 Lessing Walter Benno
- 👤 Lessing Heinz Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:57
CPC Classifications
D; D06; D06H; D06H3/00; D06H3/08; D04; D04B; D04B35/00; D04B35/10; D04B35/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2290257A
Cited
US2346240A
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US2611097A
Cited
US2560606A
Cited
US2691736A
Cited
US2745021A
Cited
US2669663A
Cited
US2694911A
Cited
US2735919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |