US2841657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traffic monitor for electronic telephone system
Assignee: General Dynamics Corp
•
Filing: 1955-03-18
•
Granted: 1958-07-01
•
Expires: 1975-03-18
Abstract
No abstract record available.
Inventors
- 👤 Robert B Trousdale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:56
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04M; H04M3/00; H04M3/22; H04M3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2413001A
Cited
US2487191A
Cited
US2680210A
Cited
US2474040A
Cited
US2686276A
Cited
US2709722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |