US1843849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for automatically transmitting messages over alpha telephone line
Assignee: Individual
•
Filing: 1930-04-07
•
Granted: 1932-02-02
•
Expires: 1950-04-07
Abstract
No abstract record available.
Inventors
- 👤 Benjamin F Thornton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:34
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/50
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) | 1935-02-01 | 1935-08-03 | 1936-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-02-01 | 1939-08-03 | 1940-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-02-01 | 1943-08-03 | 1944-02-02 | $7700.00 | Window Closed / Lapsed |