Patent US2707898A successfully refreshed from Google Patents.
US2707898A
Expired / Lapsed
US
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Vertically oriented optical system
Assignee: North American Aviation Corp
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Filing: 1952-08-04
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Granted: 1955-05-10
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Expires: 1972-08-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert B Horsfall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:03
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/30; G01; G01C; G01C5/00; G02B19/00; G02B19/0004; G02B19/0028; G02B19/0033; G02B19/0047; G02B27/64; G02B27/646; G02B27/648
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US2451409A
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US1085612A
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US2124892A
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US2173142A
Cited
US2577807A
Cited
US2590184A
Cited
US2557340A
Cited
US2633050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-09 | 1958-11-08 | 1959-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-09 | 1962-11-08 | 1963-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-09 | 1966-11-08 | 1967-05-10 | $7700.00 | Window Closed / Lapsed |