Patent US3265765A successfully refreshed from Google Patents.
US2985722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for automatically regulating side-tone damping of telephone stations
Assignee: Siemens and Halske AG
•
Filing: 1956-12-20
•
Granted: 1961-05-23
•
Expires: 1976-12-20
Abstract
No abstract record available.
Inventors
- 👤 Hoestermann Karl-Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:20
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/58
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |