US2798161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio wave combination tuners
Assignee: Polytechnic Res & Dev Co Inc
•
Filing: 1952-09-16
•
Granted: 1957-07-02
•
Expires: 1972-09-16
Abstract
No abstract record available.
Inventors
- 👤 Herbert A Finke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:50
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/02; H01F; H01F21/00; H01F21/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1339772A
Cited
US1643782A
Cited
US2126541A
Cited
US2163645A
Cited
US2498529A
Cited
US2543560A
Cited
US2694150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |