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US2970518A
Expired / Lapsed
US
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Catoptric system
Assignee: Individual
•
Filing: 1958-12-29
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Granted: 1961-02-07
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Expires: 1978-12-29
Abstract
No abstract record available.
Inventors
- 👤 Karl F Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:56
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02; G02B17/06; G02B17/0647; G02B17/0663; G02B17/0652
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2380887A
Cited
US2520634A
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US2741691A
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US2737850A
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US2769373A
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US2869423A
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US2786387A
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FR1137322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |