Patent US2946970A successfully refreshed from Google Patents.
US2946970A
Expired / Lapsed
US
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Repeater amplifiers for surface wave transmission
Assignee: Individual
•
Filing: 1956-04-11
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Granted: 1960-07-26
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Expires: 1976-04-11
Abstract
No abstract record available.
Inventors
- 👤 Hafner Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:23
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/52; H01; H01P; H01P3/00; H01P3/10; H01P5/00; H01P5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE814486C
Cited
US2685068A
Cited
US2723378A
Cited
GB679903A
Cited
US2770783A
Cited
GB682817A
Cited
US2812032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |