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Patent US2780683A successfully refreshed from Google Patents.
US2780683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tone control
Assignee: Individual
•
Filing: 1952-07-02
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Granted: 1957-02-05
•
Expires: 1972-07-02
Abstract
No abstract record available.
Inventors
- 👤 Hanson Henning Everett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:30
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)
US1715501A
Cited
GB340615A
Cited
US1984450A
Cited
US1931596A
Cited
US2118075A
Cited
US2505254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |