Patent US2869423A successfully refreshed from Google Patents.
US2869423A
Expired / Lapsed
US
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Reflective optical systems
Assignee: Individual
•
Filing: 1954-05-03
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Granted: 1959-01-20
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Expires: 1974-05-03
Abstract
No abstract record available.
Inventors
- 👤 Legare W Hoge
- 👤 Ralph L Pendley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:36
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02; G02B17/06; G02B17/0626
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2252246A
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US1552451A
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US1698905A
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US1747928A
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US1785347A
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US2157138A
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US2296943A
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US2576147A
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US2653249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |