US2554834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling for telephone receivers and hearing aid sets
Assignee: AT&T Inc
•
Filing: 1948-06-29
•
Granted: 1951-05-29
•
Expires: 1968-06-29
Abstract
No abstract record available.
Inventors
- 👤 Grant G Lavery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:36
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US529174A
Cited
US1602759A
Cited
US2005973A
Cited
US1928669A
Cited
US2160829A
Cited
GB495171A
Cited
US2204529A
Cited
US2268665A
Cited
US2409481A
Cited
US2348138A
Cited
US2485405A
Cited
GB589918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |