US3908168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio transmission system
Assignee: UDAK Corp
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Filing: 1973-12-06
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Granted: 1975-09-23
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Expires: 1993-12-06
Abstract
Abstract A radio transmission system for use by the operator of a motorcycle or other vehicle subject to high background noise, comprising a helmet worn by the operator and carrying a small low powered transmitter including a microphone located adjacent the operator''s mouth at all times. A small receiver carried by the motorcycle is tuned to the frequency of the transmitter and its output is connected by a wire conductor to the input of a relatively high powered transmitter carried by the motorcycle and operating on a different frequency.
Inventors
- 👤 John E Mcmahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:13
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/3822; H04B1/3827; H04B1/385; H04B2001/3866
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
A radio transmission system for use by the operator of a vehicle operating under relatively high background noise conditions, said vehicle carrying a first relatively high powered radio transmitter having a first radio frequency output circuit and an audio frequency input circuit comprising: a removable helmet carried by said operator, a second relatively low powered radio transmitter carried by said helmet, a microphone electrically connected to said second transmitter, said microphone being carried by said helmet adjacent said operators mouth, and an antenna integral throughout its length with said helmet and electrically connected to said second transmitter; a raDio receiver carried by said vehicle for receiving radio frequency signals transmitted by said second transmitter, said receiver having an audio frequency output circuit, and means connecting said audio frequency output circuit to said audio frequency input circuit of said first transmitter.
Claim 2
Dependent Claim
140 words
A radio transmission system for use by the operator of a vehicle operating under relatively high background noise conditions, said vehicle carrying a first relatively high powered radio transmitter having a first radio frequency output circuit and an audio frequency input circuit comprising: a removable helmet carried by said operator, a second relatively low powered radio transmitter carried by said helmet, a microphone electrically connected to said second transmitter, said microphone being carried by said helmet adjacent said operators mouth, and an antenna integral throughout its length with said helmet and electrically connected to said second transmitter; a raDio receiver carried by said vehicle for receiving radio frequency signals transmitted by said second transmitter, said receiver having an audio frequency output circuit, and means connecting said audio frequency output circuit to said audio frequency input circuit of said first transmitter.
Claim 3
Dependent Claim
45 words
A radio transmission system as defined in claim 1 wherein said first transmitter includes a second microphone, and switch means for selectively connecting said second microphone or said audio frequency output circuit of said receiver to said audio frequency input circuit of said first transmitter.
Claim 4
Dependent Claim
61 words
A radio transmission system as defined in claim 1 wherein said second transmitter comprises a second audio frequency input circuit, said first mentioned microphone being normally disconnected from said second audio frequency input circuit, and voice controlled switching means for connecting said first mentioned microphone to said second audio frequency input circuit when said operator speaks into said first mentioned microphone.
References Cited (Backward Citations)
US3290597A
Cited
US3699443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |