US2745907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tone control circuit
Assignee: Individual
•
Filing: 1951-05-03
•
Granted: 1956-05-15
•
Expires: 1971-05-03
Abstract
No abstract record available.
Inventors
- 👤 Gunter K Guttwein
- 👤 Carlton E Bessey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:39
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/02; H03G5/04; H03G5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1910040A
Cited
GB598287A
Cited
US2332782A
Cited
US2372419A
Cited
US2366565A
Cited
US2495511A
Cited
US2616988A
Cited
US2580376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |