US2916554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system
Assignee: General Dynamics Corp
•
Filing: 1956-03-28
•
Granted: 1959-12-08
•
Expires: 1976-03-28
Abstract
No abstract record available.
Inventors
- 👤 William W Pharis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:51
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1739245A
Cited
USRE17666E
Cited
US1775146A
Cited
US2335481A
Cited
US2391389A
Cited
US2465359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |