US2506437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined voice and facsimile system
Assignee: AT&T Inc
•
Filing: 1946-06-01
•
Granted: 1950-05-02
•
Expires: 1966-06-01
Abstract
No abstract record available.
Inventors
- 👤 Edward F Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:37
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06; H04M11/064; H04N; H04N1/00; H04N1/00095; H04N1/00103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2402083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-01 | 1953-10-31 | 1954-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-01 | 1957-10-31 | 1958-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-01 | 1961-10-31 | 1962-05-02 | $7700.00 | Window Closed / Lapsed |