Patent US2757567A successfully refreshed from Google Patents.
US2757567A
Expired / Lapsed
US
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Theodolite having scale reading means
Assignee: Keuffel and Esser Co
•
Filing: 1951-12-05
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Granted: 1956-08-07
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Expires: 1971-12-05
Abstract
No abstract record available.
Inventors
- 👤 Conway D Hillman
- 👤 Allister L Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:12
CPC Classifications
G; G01; G01C; G01C1/00; G01C1/02; G01C1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1542397A
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GB387776A
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US2221317A
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US2144696A
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DE745953C
Cited
GB541948A
Cited
US2359484A
Cited
US2363877A
Cited
US2480237A
Cited
US2498273A
Cited
US2552893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-07 | 1960-02-06 | 1960-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-07 | 1964-02-06 | 1964-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-07 | 1968-02-06 | 1968-08-07 | $7700.00 | Window Closed / Lapsed |