US3939418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Walkie-talkie device
Assignee: Glass Marvin and Associates
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Filing: 1974-10-07
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Granted: 1976-02-17
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Expires: 1994-10-07
Abstract
Abstract A walkie-talkie unit having a speaker connected to a radio transceiver for normal transmitting and receiving functions, plus a selectively actuatable audio signal generator. The generator generates one of a plurality of distinct signals of different frequency in response to a hand manipulatable actuator. When the walkie-talkie is in a transmitting mode the signal is transmitted to another walkie-talkie. When the walkie-talkie is in a receiving mode the signal is amplified by the generating walkie-talkie.
Inventors
- 👤 Howard J. Morrison
- 👤 Albert G. Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:54
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
109 words
In a walkie-talkie unit including a microphone/speaker connected to a radio transceiver including an RF source, a power supply, a modulator, an audio amplifier, an antenna, a detector for transmitting and receiving audio signals and switch means for selectively operating in either a transmit or receive mode, the improvement comprising: a selectively actuatable audio signal generator connected to said transceiver for generating an audio signal of at least one frequency for transmission to another walkie-talkie when in a transmitting mode as well as generating sound from its speaker when in a receiving mode; and a hand manipulatable actuator to selectively actuate said signal generator in either of said modes.
Claim 2
Dependent Claim
109 words
In a walkie-talkie unit including a microphone/speaker connected to a radio transceiver including an RF source, a power supply, a modulator, an audio amplifier, an antenna, a detector for transmitting and receiving audio signals and switch means for selectively operating in either a transmit or receive mode, the improvement comprising: a selectively actuatable audio signal generator connected to said transceiver for generating an audio signal of at least one frequency for transmission to another walkie-talkie when in a transmitting mode as well as generating sound from its speaker when in a receiving mode; and a hand manipulatable actuator to selectively actuate said signal generator in either of said modes.
Claim 3
Dependent Claim
16 words
The walkie-talkie unit of claim 1 wherein said signal generator comprises at least one electronic oscillator.
Claim 4
Dependent Claim
46 words
The walkie-talkie unit of claim 1 wherein said walkie-talkie includes a housing with a cover member pivotally mounted on said housing over said speaker, said cover member being movable from a normally shut position to an open position in response to the manipulation of the actuator.
Claim 5
Dependent Claim
43 words
The walkie-talkie unit of claim 2 wherein the electronic oscillator is a relaxation oscillator including at least one capacitor and one resistor connected to the power supply and at least one transistor to cyclically discharge the capacitator to produce the audio frequency signal.
Claim 6
Dependent Claim
15 words
The walkie-talkie unit of claim 11 wherein said oscillator includes at least one unijunction transistor.
Claim 7
Dependent Claim
37 words
The walkie-talkie unit of claim 2 wherein said signal generator comprises a pair of electronic oscillators connected in parallel across the power source to interact with one another when actuated to generate a warbling audio frequency signal.
Claim 8
Dependent Claim
118 words
In a walkie-talkie unit including a microphone/speaker connected to a radio transceiver including an RF source, a power supply, a modulator, an audio amplifier, an antenna, a detector for transmitting and receiving audio signals and switch means for selectively operating in either a transmit or receive mode, the improvement comprising: a selectively actuatable signal generator connected to said transceiver for generating one of a plurality of distinct signals of different frequency for transmitting a signal of one frequency to another walkie-talkie when in a transmitting mode and generating a signal of another frequency from the speaker when in a receiving mode; and a hand manipulatable actuator to selectively actuate said signal generator for generating one of the frequencies.
Claim 9
Dependent Claim
118 words
In a walkie-talkie unit including a microphone/speaker connected to a radio transceiver including an RF source, a power supply, a modulator, an audio amplifier, an antenna, a detector for transmitting and receiving audio signals and switch means for selectively operating in either a transmit or receive mode, the improvement comprising: a selectively actuatable signal generator connected to said transceiver for generating one of a plurality of distinct signals of different frequency for transmitting a signal of one frequency to another walkie-talkie when in a transmitting mode and generating a signal of another frequency from the speaker when in a receiving mode; and a hand manipulatable actuator to selectively actuate said signal generator for generating one of the frequencies.
Claim 10
Dependent Claim
15 words
The walkie-talkie unit of claim 7 wherein said signal generator is a multifrequency electronic oscillator.
Claim 11
Dependent Claim
40 words
The walkie-talkie unit of claim 7 wherein said walkie-talkie includes a housing with a cover pivotally mounted over said speaker, said cover being movable from a normally shut position to an open position in response to manipulation of the actuator.
Claim 12
Dependent Claim
43 words
The walkie-talkie unit of claim 6 wherein the electronic oscillator is a relaxation oscillator including at least two capacitors and two resistors connected to the power supply and at least two transistors to cyclically discharge the capacitors to produce the audio frequency signal.
Claim 13
Dependent Claim
15 words
The walkie-talkie unit of claim 10 wherein said oscillator includes a plurality of unijunction transistors.
Claim 14
Dependent Claim
28 words
The walkie-talkie unit of claim 10 wherein said actuator includes switch means connected to said oscillator and a resistor for selectively producing a signal of a different frequency.
Claim 15
Dependent Claim
55 words
The walkie-talkie unit of claim 12 wherein said oscillator includes a pair of resistors of different values connected in parallel to one of said transistors, and said switch means is connected to said transistors and resistors for selectively adding one of the parallel resistors to the circuit to vary the frequency of said one transistor.
Claim 16
Dependent Claim
37 words
The walkie-talkie unit of claim 8 wherein said signal generator comprises a pair of electronic oscillators connected in parallel across the power source to interact with one another when actuated to generate a warbling audio frequency signal.
References Cited (Backward Citations)
US3315263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |