Patent US2264562A successfully refreshed from Google Patents.
Patent US2469555A successfully refreshed from Google Patents.
US2469555A
Expired / Lapsed
US
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Selective radio communication system for a plurality of stations
Assignee: SPX Technologies Inc
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Filing: 1945-06-19
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Granted: 1949-05-10
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Expires: 1965-06-19
Abstract
No abstract record available.
Inventors
- 👤 Forest B Hitchcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:39
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04W; H04W16/00; H04W16/24
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) | 1952-05-09 | 1952-11-08 | 1953-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-09 | 1956-11-08 | 1957-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-09 | 1960-11-08 | 1961-05-10 | $7700.00 | Window Closed / Lapsed |