Patent US3564551A successfully refreshed from Google Patents.
US3564551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dipole antenna with electrically tuned ferrite sleeves
Assignee: Individual
•
Filing: 1970-01-14
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Granted: 1971-02-16
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Expires: 1990-01-14
Abstract
Abstract A TUNABLE ANTENNA SYSTEM HAVING RADIATING ELEMENTS WITH MEANS HAVING A NORMALLY FIXED PERMEABILITY ASSOCIATED THEREWITH, A MEANS FOR PRODUCING A MAGNETIC FIELD OF VARYING STRENGTHS TO CHANGE THE PERMEABILITY OF THE MEANS HAVING THE NORMALLY FIXED PERMEABILITY AND MEANS FOR SELECTIVELY ADJUSTING THE STRENGTH OF THE MAGNETIC FIELD TO VARY THE INDUCTANCE EFFECT OFFERED TO THE RADIANT ENERGY.
Inventors
- 👤 Harry A Mills
- 👤 Edward Lipson
- 👤 Noel R Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:00
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/06; H01Q9/14; H01Q9/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |