Patent US3568963A successfully refreshed from Google Patents.
Patent US2773934A successfully refreshed from Google Patents.
US2773934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic telephone system
Assignee: General Dynamics Corp
•
Filing: 1949-12-24
•
Granted: 1956-12-11
•
Expires: 1969-12-24
Abstract
No abstract record available.
Inventors
- 👤 Robert B Trousdale
- 👤 Frank A Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:50
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |