Patent US2720029A successfully refreshed from Google Patents.
US2720029A
Expired / Lapsed
US
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Photogrammetric apparatus
Assignee: FAIRCHILD AERIAL SURVEYS Inc
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Filing: 1952-09-22
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Granted: 1955-10-11
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Expires: 1972-09-22
Abstract
No abstract record available.
Inventors
- 👤 Leon T Eliel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:08
CPC Classifications
G; G01; G01C; G01C11/00; G01C11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1585484A
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US1331978A
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US1650978A
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US2055883A
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US1980657A
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US2167412A
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US2403755A
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US2414566A
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US2489218A
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US2489221A
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US2610226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |