US2503787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio receiver gain control
Assignee: Hartford National Bank and Trust Co
•
Filing: 1947-07-30
•
Granted: 1950-04-11
•
Expires: 1967-07-30
Abstract
No abstract record available.
Inventors
- 👤 Westerveld Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:25
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36; H03F3/00; H03F3/46; H03F3/48; H03G; H03G3/00; H03G3/02; H03G3/04; H03G3/06; H03G3/08; H03G5/00; H03G5/02; H03G5/04; H03G5/06; H03G5/08; H03G9/00; H03G9/02; H03G9/04; H03G9/06; H03G9/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1996830A
Cited
US2159453A
Cited
US1988370A
Cited
GB396822A
Cited
US2115842A
Cited
US2205243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |