Patent US2520749A successfully refreshed from Google Patents.
US2520749A
Expired / Lapsed
US
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Motor-driven push-button tuner
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1947-01-11
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Granted: 1950-08-29
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Expires: 1967-01-11
Abstract
No abstract record available.
Inventors
- 👤 Ware Paul
- 👤 Bernard Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:41
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/02; H03J5/14; H03J5/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US503420A
Cited
US1022708A
Cited
US937844A
Cited
AT97212B
Cited
US1490328A
Cited
US1728186A
Cited
US2320628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |