Patent US3884816A successfully refreshed from Google Patents.
Patent US1478892A successfully refreshed from Google Patents.
Patent US1741670A successfully refreshed from Google Patents.
Patent US3344799A successfully refreshed from Google Patents.
Patent EP0726574A2 successfully refreshed from Google Patents.
Patent US2332704A successfully refreshed from Google Patents.
Patent US1728039A successfully refreshed from Google Patents.
US1728039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone receiver and like instrument
Assignee: General Electric Co
•
Filing: 1926-05-11
•
Granted: 1929-09-10
•
Expires: 1946-05-11
Abstract
No abstract record available.
Inventors
- 👤 John H Butcher
- 👤 George H Bird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:22
CPC Classifications
H; H04; H04R; H04R13/00; H04R13/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1932-09-09 | 1933-03-11 | 1933-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-09-09 | 1937-03-11 | 1937-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-09-09 | 1941-03-11 | 1941-09-10 | $7700.00 | Window Closed / Lapsed |