US2659976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slope level
Assignee: Individual
•
Filing: 1947-02-28
•
Granted: 1953-11-24
•
Expires: 1967-02-28
Abstract
No abstract record available.
Inventors
- 👤 Callahan Ezra Leo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US426696A
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US505937A
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DE527754C
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US662977A
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US740491A
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US776277A
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US839662A
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US875243A
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US905054A
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US977735A
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US1024863A
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US1014402A
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US1043605A
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US1145719A
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US1215711A
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US1409342A
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US1640020A
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US1855394A
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US1855664A
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US2068128A
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US2097848A
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US2160049A
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US2211201A
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US2220029A
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US2332347A
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US2370753A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |