Patent US2588031A successfully refreshed from Google Patents.
US2588031A
Expired / Lapsed
US
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Radio communication system
Assignee: SPX Technologies Inc
•
Filing: 1947-11-01
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Granted: 1952-03-04
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Expires: 1967-11-01
Abstract
No abstract record available.
Inventors
- 👤 John C O'brien
- 👤 Jr Henry C Sibley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:42
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/22; H03G3/26; H03G3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2007399A
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US2151145A
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US2173426A
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US2243414A
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US2296089A
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US2280421A
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US2343115A
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US2301649A
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US2316902A
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US2351191A
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US2351212A
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US2412482A
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US2435010A
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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) | 1955-03-04 | 1955-09-03 | 1956-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-04 | 1959-09-03 | 1960-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-04 | 1963-09-03 | 1964-03-04 | $7700.00 | Window Closed / Lapsed |