US2947819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic switching telephone system
Assignee: General Dynamics Corp
•
Filing: 1958-03-13
•
Granted: 1960-08-02
•
Expires: 1978-03-13
Abstract
No abstract record available.
Inventors
- 👤 Brightman Barrie
- 👤 Pearce James Gordon
- 👤 Matthew P Tubinis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:35
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2522000A
Cited
US2577141A
Cited
US2727094A
Cited
US2747021A
Cited
US2921137A
Cited
US2890284A
Cited
US2841657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |