Patent US3428021A successfully refreshed from Google Patents.
US3428021A
Expired / Lapsed
US
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Multiple high frequency tuning dial structure
Assignee: Thomas International Corp
•
Filing: 1964-09-04
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Granted: 1969-02-18
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Expires: 1984-09-04
Abstract
No abstract record available.
Inventors
- 👤 Bernhard R Kuhl
- 👤 Donald H Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:06
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/02; Y; Y10; Y10S; Y10S116/00; Y10S116/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2802174A
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US2772353A
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US2772351A
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US2738758A
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US2932019A
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US3201726A
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US3240182A
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US3179907A
Cited
US3196695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |