US4008478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rifle barrel serving as radio antenna
Assignee: United States Department of the Army
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Filing: 1975-12-31
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Granted: 1977-02-15
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Expires: 1995-12-31
Abstract
Abstract A toroidal coil mounted around the barrel of a rifle permits the rifle to act as a camouflaged antenna for a VHF transceiver.
Inventors
- 👤 Kurt Ikrath
- 👤 William Kennebeck
- 👤 Jack Wills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:09
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
In combination: a. a weapon having an elongated, electrically-conductive barrel; b. a radio-frequency transceiver providing an r.f. output and being mounted to said weapon; c. a helical toroidal r.f. transformer coil co-axially mounted about said barrel and coupling said r.f. output to said barrel, said barrel acting as the antenna for said transceiver and as a low-impedance secondary load for said toroidal transformer; and d. means for insulating said toroidal transformer coil from said conductive barrel, said toroidal transformer coil extending transversely around said insulating means and barrel.
Claim 2
Dependent Claim
88 words
In combination: a. a weapon having an elongated, electrically-conductive barrel; b. a radio-frequency transceiver providing an r.f. output and being mounted to said weapon; c. a helical toroidal r.f. transformer coil co-axially mounted about said barrel and coupling said r.f. output to said barrel, said barrel acting as the antenna for said transceiver and as a low-impedance secondary load for said toroidal transformer; and d. means for insulating said toroidal transformer coil from said conductive barrel, said toroidal transformer coil extending transversely around said insulating means and barrel.
Claim 3
Dependent Claim
39 words
The combination according to claim 1 wherein said coil is mounted around the lower end of said barrel and further including: means for achieving a resonant match between said r.f. transformer and the transmitter output stage of said transceiver.
Claim 4
Dependent Claim
34 words
The combination according to claim 2 wherein said resonance achieving means comprises a first adjustable series-connected capacitor and a second adjustable parallel-connected capacitor interposed between said transformer and the output stage of said transceiver.
Claim 5
Dependent Claim
31 words
The combination of claim 3 wherein said weapon is a rifle, said transceiver and said transformer coil being external to said barrel to avoid interference with the operation of said rifle.
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) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |