Patent US5313653A successfully refreshed from Google Patents.
Patent US2882341A successfully refreshed from Google Patents.
US2882341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system
Assignee: General Dynamics Corp
•
Filing: 1952-07-28
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Granted: 1959-04-14
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Expires: 1972-07-28
Abstract
No abstract record available.
Inventors
- 👤 Robert B Trousdale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:37
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2544944A
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US2633496A
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US2619548A
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US2585022A
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US2613279A
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US2652455A
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US2602121A
Cited
US2754367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |