US2653199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay
Assignee: AT&T Inc
•
Filing: 1948-11-05
•
Granted: 1953-09-22
•
Expires: 1968-11-05
Abstract
No abstract record available.
Inventors
- 👤 John T L Brown
- 👤 Walter B Ellwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:52
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/28; H01H51/287; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US684378A
Cited
US2207082A
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US2264022A
Cited
US2372965A
Cited
US2332338A
Cited
US2438897A
Cited
US2455524A
Cited
US2487052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |