US2662122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-way transistor electrical transmission system
Assignee: AT&T Inc
•
Filing: 1949-06-01
•
Granted: 1953-12-08
•
Expires: 1969-06-01
Abstract
No abstract record available.
Inventors
- 👤 Robert M Ryder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:38
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/62; H04; H04B; H04B3/00; H04B3/02; H04B3/36; H04J; H04J1/00; H04J1/02; H04J1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1953496A
Cited
US2020297A
Cited
GB473895A
Cited
US2499423A
Cited
US2486776A
Cited
US2476323A
Cited
US2541322A
Cited
US2585078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |