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Patent US2101668A successfully refreshed from Google Patents.
US2101668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio communication system
Assignee: AT&T Inc
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Filing: 1935-09-26
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Granted: 1937-12-07
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Expires: 1955-09-26
Abstract
No abstract record available.
Inventors
- 👤 John B Bishop
- 👤 William M Knott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:38
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)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-12-06 | 1941-06-07 | 1941-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-12-06 | 1945-06-07 | 1945-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-12-06 | 1949-06-07 | 1949-12-07 | $7700.00 | Window Closed / Lapsed |