Patent US2647320A successfully refreshed from Google Patents.
US2647320A
Expired / Lapsed
US
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Theodolite
Assignee: Keuffel and Esser Co
•
Filing: 1950-09-15
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Granted: 1953-08-04
•
Expires: 1970-09-15
Abstract
No abstract record available.
Inventors
- 👤 Carl W Keuffel
- 👤 Allister L Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:17
CPC Classifications
G; G01; G01B; G01B3/00; G01B3/02; G01C; G01C1/00; G01C1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US918190A
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US1777853A
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US2153109A
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US2164051A
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US2280057A
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GB548512A
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GB548513A
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US2329978A
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US2431290A
Cited
US2531252A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |