US2294910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling and communication system
Assignee: AT&T Inc
•
Filing: 1941-03-26
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Granted: 1942-09-08
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Expires: 1961-03-26
Abstract
No abstract record available.
Inventors
- 👤 John B Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:11
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/62; H03F3/64; H01; H01J; H01J17/00; H01J17/38; H01J17/40; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0067
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) | 1945-09-07 | 1946-03-09 | 1946-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-09-07 | 1950-03-09 | 1950-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-09-07 | 1954-03-09 | 1954-09-08 | $7700.00 | Window Closed / Lapsed |