Patent US2680239A successfully refreshed from Google Patents.
US2680239A
Expired / Lapsed
US
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Data selection system
Assignee: Engineering Research Associates Inc
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Filing: 1952-02-26
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Granted: 1954-06-01
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Expires: 1972-02-26
Abstract
No abstract record available.
Inventors
- 👤 Howard L Daniels
- 👤 John W Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:00
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |