Patent US2968228A successfully refreshed from Google Patents.
US2968228A
Expired / Lapsed
US
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Zenith and level recording camera and level
Assignee: PHOTOGRAMMETRY Inc
•
Filing: 1955-12-02
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Granted: 1961-01-17
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Expires: 1975-12-02
Abstract
No abstract record available.
Inventors
- 👤 Everett L Merritt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:21
CPC Classifications
G; G03; G03B; G03B37/00; G03B37/06; G03B17/00; G03B17/56; G03B17/561
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2402216A
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US1533941A
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US1653585A
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US2047070A
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US1880960A
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US2352644A
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US2375356A
Cited
FR948680A
Cited
US2671388A
Cited
FR1079027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |