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US2888643A
Expired / Lapsed
US
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Apparatus for determining frequency
Assignee: General Electric Co
•
Filing: 1955-04-29
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Granted: 1959-05-26
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Expires: 1975-04-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry R Summerhayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:32
CPC Classifications
G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2396688A
Cited
US2406125A
Cited
US2624005A
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US2564205A
Cited
US2730620A
Cited
US2802899A
Cited
US2793347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |