Patent US2999225A successfully refreshed from Google Patents.
US2999225A
Expired / Lapsed
US
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Electronic switching apparatus and method
Assignee: Individual
•
Filing: 1955-01-20
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Granted: 1961-09-05
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Expires: 1975-01-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Earle C Gregg
- 👤 Erwin F Shrader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:58
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2560587A
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US2567229A
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US2476902A
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US2757284A
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US2755455A
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US2787707A
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US2777018A
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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) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |