Patent US4214246A successfully refreshed from Google Patents.
US4214246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continually adjustable frequency antenna
Assignee: Individual
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Filing: 1978-11-29
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Granted: 1980-07-22
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Expires: 1998-11-29
Abstract
Abstract An antenna for remote and continuous adjustment within a wide frequency range, by variation of the inductance, and hence the length of a small diameter coil, by means of a slide which short circuits the turns thereof, until a full short circuit is reached.
Inventors
- 👤 Juan M. Arechavala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:10
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/06; H01Q9/14; H01Q9/145
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A continually adjustable frequency antenna, comprising (a) a supporting tube connected to an antenna and having a winding on its exterior; (b) a sliding piston mounted for upward and downward movement within said supporting tube and having means thereon preventing it from rotating with respect to said supporting tube; (c) a threaded rod attached by one of its ends to said sliding piston; (d) a second tube within said supporting tube and receiving said threaded rod when said sliding piston moves downwardly; (e) means for rotatably driving said second tube; (f) said threaded rod being moved from its uppermost to its lowermost position by a rotating nut located at one end of said second tube.
Claim 2
Dependent Claim
115 words
A continually adjustable frequency antenna, comprising (a) a supporting tube connected to an antenna and having a winding on its exterior; (b) a sliding piston mounted for upward and downward movement within said supporting tube and having means thereon preventing it from rotating with respect to said supporting tube; (c) a threaded rod attached by one of its ends to said sliding piston; (d) a second tube within said supporting tube and receiving said threaded rod when said sliding piston moves downwardly; (e) means for rotatably driving said second tube; (f) said threaded rod being moved from its uppermost to its lowermost position by a rotating nut located at one end of said second tube.
Claim 3
Dependent Claim
31 words
An antenna according to claim 1, comprising a resilient slipper on said sliding piston engaging within a longitudinal slot in said supporting tube and contacting the inner side of said winding.
Claim 4
Dependent Claim
32 words
An antenna according to claim 1, comprising a friction coupling for rotatably driving said second tube, whereby at the end of the strokes said sliding piston continues rotation of said driving means.
Claim 5
Dependent Claim
19 words
An antenna according to claim 1, wherein said driving means comprises a reversible electric motor and a gear train.
Claim 6
Dependent Claim
36 words
An antenna according to claim 1, comprising switch means for reversing the direction of the motor and displacement of said sliding piston, and means on said second tube for actuating an indicator light upon its rotation.
Claim 7
Dependent Claim
52 words
An antenna according to claim 1, wherein said supporting tube is arranged within an outer tube, said second tube being arranged within a tube guide means positioned within said outer tube, in contact with and below said supporting tube, said supporting tube and said second tube being fixed against rotation and displacement.
References Cited (Backward Citations)
US2069513A
Cited
US3381222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |