US2908765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentrator for telephone answering service
Assignee: General Dynamics Corp
•
Filing: 1958-04-10
•
Granted: 1959-10-13
•
Expires: 1978-04-10
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Gatzert
- 👤 William W Pharis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:56
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/58
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2258853A
Cited
US2358017A
Cited
US2542079A
Cited
US2783306A
Cited
US2715658A
Cited
US2787667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |