Patent US2162135A successfully refreshed from Google Patents.
Patent US2489835A successfully refreshed from Google Patents.
US2489835A
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Optical projection system having apertured concave image forming mirror
Assignee: Lanteris Space LLC
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Filing: 1945-11-14
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Granted: 1949-11-29
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Expires: 1965-11-14
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Traub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:05
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/0888
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1870702A
Cited
US2170979A
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US2234227A
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US2251984A
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USRE22628E
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US2273801A
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CH214749A
Cited
US2316550A
Cited
US2342874A
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US2295779A
Cited
US2307210A
Cited
US2295802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |