US2419697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic telephone receiver
Assignee: HETTIE DENT
•
Filing: 1944-11-10
•
Granted: 1947-04-29
•
Expires: 1964-11-10
Abstract
No abstract record available.
Inventors
- 👤 Wolff Joachim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:37
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/06; H04R2225/00; H04R2225/025; H04R2499/00; H04R2499/10; H04R2499/11; H04R25/00; H04R25/65
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1283304A
Cited
US1403592A
Cited
US1026196A
Cited
US1096127A
Cited
US1542746A
Cited
GB214787A
Cited
US1639546A
Cited
US2064426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-28 | 1950-10-28 | 1951-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-28 | 1954-10-28 | 1955-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-28 | 1958-10-28 | 1959-04-29 | $7700.00 | Window Closed / Lapsed |