Patent US2498635A successfully refreshed from Google Patents.
US2498635A
Expired / Lapsed
US
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Duplex radio system
Assignee: International Standard Electric Corp
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Filing: 1947-05-21
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Granted: 1950-02-28
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Expires: 1967-05-21
Abstract
No abstract record available.
Inventors
- 👤 Robert S Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:21
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44; H04B1/46
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) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |