Patent US3305811A successfully refreshed from Google Patents.
US3305811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broad band radio frequency transformer
Assignee: Individual
•
Filing: 1965-03-25
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Granted: 1967-02-21
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Expires: 1985-03-25
Abstract
No abstract record available.
Inventors
- 👤 John H Toombs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:01
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/06; H01F2017/065
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
37 words
A WIDE BAND RADIO FREQUENCY TRANSFORMER COMPRISING A PLURALITY OF HOLLOW FERRITE CORE ELEMENTS ARRANGED END-TO-END TO FORM A CLOSED LOOP WITH ONE OR MORE WINDINGS THREADED THROUGH THE CAVITY FORMED BY SAID PLURALITY OF CORE ELEMENTS.
References Cited (Backward Citations)
US2731607A
Cited
US2962678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |