US4152705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable top loaded antenna
Assignee: Mobile Mark Inc
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Filing: 1977-01-10
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Granted: 1979-05-01
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Expires: 1997-01-10
Abstract
Abstract An adjustable mobile antenna comprising an upper metal mast and a lower metal mast, the upper mast being telescopically received in the lower mast and adjustably movable longitudinally therein to vary the length of the antenna and thereby effect tuning thereof, a clamping member for releasably locking the upper mast in a selected position relative to the lower mast, a dielectric rod extending upwardly from the upper end of the upper metal mast, and a loading coil helically wound on the dielectric rod with a lower end of the coil connected to the upper metal mast adjacent the upper end thereof, and a protective outer jacket covering the loading coil, the antenna being tunable by simply adjusting its length.
Inventors
- 👤 Gilbert J. Kowols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:48
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/08; H01Q1/10; H01Q9/00; H01Q9/04; H01Q9/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
An adjustable mobile antenna comprising, in combination, a hollow tubular lower metal mast, an upper metal mast telescoped into said lower mast and longitudinally adjustable therein to vary the overall length of the antenna and thereby tune the same, locking means associated with said upper and lower masts for releasably locking said upper mast in a selected fixed position relative to said lower mast, a dielectric rod mounted to the upper end of said upper mast, and a loading coil wound on said rod.
Claim 2
Dependent Claim
84 words
An adjustable mobile antenna comprising, in combination, a hollow tubular lower metal mast, an upper metal mast telescoped into said lower mast and longitudinally adjustable therein to vary the overall length of the antenna and thereby tune the same, locking means associated with said upper and lower masts for releasably locking said upper mast in a selected fixed position relative to said lower mast, a dielectric rod mounted to the upper end of said upper mast, and a loading coil wound on said rod.
Claim 3
Dependent Claim
37 words
An antenna as defined in claim 1 where said upper mast is formed as a solid metal rod having a hollow tubular upper end portion into which the lower end of said dielectric rod is fixedly mounted.
Claim 4
Dependent Claim
52 words
An antenna as defined in claim 1 where said loading coil is wound along substantially the entire length of said dielectric rod with the turns substantially against one another to achieve minimum pitch, the lower end of said loading coil being electrically connected to said upper mast adjacent the upper end thereof.
Claim 5
Dependent Claim
35 words
An antenna as defined in claim 1 where said dielectric rod is made of fiberglass, and a protective jacket is formed over the outside of said loading coil along the entire length of said rod.
Claim 6
Dependent Claim
70 words
An antenna as defined in claim 1 where the upper end of said lower metal mast is tapered radially inwardly and formed as a split collet, said locking means comprising said split collet together with an internally threaded ferrule which is threaded down on the upper end of said lower mast to cause said collet to clamp said upper metal mast in a selected position relative to said lower mast.
Claim 7
Dependent Claim
26 words
An antenna as defined in claim 1 where said upper and lower masts are made of chrome-plated brass, and said dielectric rod is made of fiberglass.
Claim 8
Dependent Claim
130 words
An adjustable mobile antenna comprising, in combination, a hollow tubular lower metal mast, an upper metal mast formed as a solid rod having a hollow tubular upper end portion, said upper metal mast being telescoped into said lower metal mast and longitudinally adjustable therein to vary the overall length of the antenna and thereby tune the same, locking means associated with said upper and lower masts for releasably locking said upper mast in a selected fixed position relative to said lower mast, a fiberglass rod having its lower end fixedly mounted in said hollow tubular upper end portion of said upper mast, a loading coil wound on said fiberglass rod, and a protective jacket formed over the outside of said loading coil along the entire length of said fiberglass rod.
Claim 9
Dependent Claim
130 words
An adjustable mobile antenna comprising, in combination, a hollow tubular lower metal mast, an upper metal mast formed as a solid rod having a hollow tubular upper end portion, said upper metal mast being telescoped into said lower metal mast and longitudinally adjustable therein to vary the overall length of the antenna and thereby tune the same, locking means associated with said upper and lower masts for releasably locking said upper mast in a selected fixed position relative to said lower mast, a fiberglass rod having its lower end fixedly mounted in said hollow tubular upper end portion of said upper mast, a loading coil wound on said fiberglass rod, and a protective jacket formed over the outside of said loading coil along the entire length of said fiberglass rod.
Claim 10
Dependent Claim
52 words
An antenna as defined in claim 7 where said loading coil is wound along substantially the entire length of said fiberglass rod with the turns substantially against one another to achieve minimum pitch, the lower end of said loading coil being electrically connected to said upper mast adjacent the upper end thereof.
Claim 11
Dependent Claim
68 words
An antenna as defined in claim 7 where the upper end of said lower metal mast is tapered inwardly and formed as a split collet, said locking means comprising said split collet together with an internally threaded ferrule which is threaded down on the upper end of said lower mast to cause said collet to clamp said upper mast in a selected position relative to said lower mast.
Claim 12
Dependent Claim
189 words
An adjustable mobile antenna comprising, in combination, a hollow tubular lower metal mast, an upper metal mast formed as a solid rod having a hollow tubular upper end portion, said upper metal mast being telescoped into said lower metal mast and adjustable longitudinally therein to vary the overall length of the antenna and thereby tune the same, the upper end of said lower metal mast being tapered inwardly and formed as a split collet, an internally threaded ferrule threaded down on the upper end of said lower mast to cause said collet to clamp said upper mast in a selected position relative to said lower mast, a fiberglass rod having its lower end fixedly mounted in said hollow tubular upper end portion of said upper mast, a loading coil wound along substantially the entire length of said fiberglass rod with the turns substantially against one another to achieve minimum pitch, the lower end of said loading coil being electrically connected to said upper mast adjacent the upper end thereof, and a protective jacket formed over the outside of said loading coil along the entire length of said fiberglass rod.
Claim 13
Dependent Claim
189 words
An adjustable mobile antenna comprising, in combination, a hollow tubular lower metal mast, an upper metal mast formed as a solid rod having a hollow tubular upper end portion, said upper metal mast being telescoped into said lower metal mast and adjustable longitudinally therein to vary the overall length of the antenna and thereby tune the same, the upper end of said lower metal mast being tapered inwardly and formed as a split collet, an internally threaded ferrule threaded down on the upper end of said lower mast to cause said collet to clamp said upper mast in a selected position relative to said lower mast, a fiberglass rod having its lower end fixedly mounted in said hollow tubular upper end portion of said upper mast, a loading coil wound along substantially the entire length of said fiberglass rod with the turns substantially against one another to achieve minimum pitch, the lower end of said loading coil being electrically connected to said upper mast adjacent the upper end thereof, and a protective jacket formed over the outside of said loading coil along the entire length of said fiberglass rod.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |