US4495649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power source device for portable type radio apparatus
Assignee: IWATA ELECTRIC Co Ltd A CORP OF JAPAN
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Filing: 1982-12-29
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Granted: 1985-01-22
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Expires: 2002-12-29
Abstract
Abstract A power source device for a portable type radio apparatus having a transmitting circuit wherein the transmitting circuit is connected to the power source through a time constant circuit and a tone signal generating circuit is connected to the time constant circuit through a delay timing circuit. The tone signal generating circuit is operated at a required time before the operation of the transmitting circuit is terminated by the time constant circuit to inform a user of the fact that the transmitting circuit is about to be stopped in operation.
Inventors
- 👤 Keisuke Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:04
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04W; H04W52/00; H04W52/02; H04W52/0209; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
A power source device for operating a portable type radio apparatus having a transmitting circuit, comprising: a power source, a time constant circuit including a capacitor connected to the output side of said power source and a switching circuit coupled to said time constant circuit and said power source for applying the power source voltage to said transmitting circuit to effect the operation thereof for a predetermined time, delay timing circuit means operative to produce an output signal after the lapse of a preset time by an output signal of said time constant circuit, a tone signal generating circuit responsive to the output signal of said delay timing circuit means to generate a tone signal representative of the fact that a required time related to said preset time has passed, and switch means connected in parallel with the capacitor of said time constant circuit for effecting a continuation of the operation of said transmitting circuit.
Claim 2
Dependent Claim
155 words
A power source device for operating a portable type radio apparatus having a transmitting circuit, comprising: a power source, a time constant circuit including a capacitor connected to the output side of said power source and a switching circuit coupled to said time constant circuit and said power source for applying the power source voltage to said transmitting circuit to effect the operation thereof for a predetermined time, delay timing circuit means operative to produce an output signal after the lapse of a preset time by an output signal of said time constant circuit, a tone signal generating circuit responsive to the output signal of said delay timing circuit means to generate a tone signal representative of the fact that a required time related to said preset time has passed, and switch means connected in parallel with the capacitor of said time constant circuit for effecting a continuation of the operation of said transmitting circuit.
Claim 3
Dependent Claim
43 words
A power source device according to claim 1, wherein said switching circuit includes a transistor connected to be turned on and off by an output of said time constant circuit to control the supply of said power source voltage to said transmitting circuit.
Claim 4
Dependent Claim
29 words
A power source device according to claim 1, wherein said delay timing circuit means includes a transistor and a bias circuit for setting the operating level of said transistor.
References Cited (Backward Citations)
US3469191A
Cited
US3500459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |