US5138246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery protecting system in a car stereo
Assignee: Pioneer Corp
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Filing: 1991-01-02
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Granted: 1992-08-11
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Expires: 2011-01-02
Abstract
Abstract A discharge detector circuit is provided for detecting a discharging state of a battery of a motor vehicle. A lower limit voltage of the battery which is a lower limit voltage for starting an engine of the vouching is detected. Power supply to a car stereo is cut off when the discharge of the battery is detected and the battery voltage decreases to the lower limit voltage.
Inventors
- 👤 Hiroshi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:30
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/60; H02J7/663; B; B60; B60R; B60R16/00; B60R16/02; B60R16/03; H02J2105/00; H02J2105/30; H02J2105/33; Y; Y10; Y10S; Y10S320/00; Y10S320/18; Y10S320/21
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
186 words
A battery protecting system in a car stereo mounted on a motor vehicle, comprising: charge-level detector means for detecting a state of charge of a battery of the motor vehicle and for producing a discharge signal; first limit detector means for detecting a first lower limit voltage of the battery which is the lower limit voltage for starting an engine of the vehicle and for producing a first limit signal when battery voltage is lower than the first lower limit voltage and higher than a second lower limit voltage which is lower than the first lower limit voltage and is a lower limit voltage for operating the car stereo; first cutting means responsive to both of the discharge signal and the first limit signal for cutting off power supply to the car stereo; second limit detector means for detecting the second lower limit voltage of the battery and for producing a second limit signal when the battery voltage is lower than the second lower limit voltage; and second cutting means responsive to the second limit signal for cutting off the power supply to the car stereo.
Claim 2
Dependent Claim
186 words
A battery protecting system in a car stereo mounted on a motor vehicle, comprising: charge-level detector means for detecting a state of charge of a battery of the motor vehicle and for producing a discharge signal; first limit detector means for detecting a first lower limit voltage of the battery which is the lower limit voltage for starting an engine of the vehicle and for producing a first limit signal when battery voltage is lower than the first lower limit voltage and higher than a second lower limit voltage which is lower than the first lower limit voltage and is a lower limit voltage for operating the car stereo; first cutting means responsive to both of the discharge signal and the first limit signal for cutting off power supply to the car stereo; second limit detector means for detecting the second lower limit voltage of the battery and for producing a second limit signal when the battery voltage is lower than the second lower limit voltage; and second cutting means responsive to the second limit signal for cutting off the power supply to the car stereo.
Claim 3
Dependent Claim
17 words
The system according to claim 1 wherein the charge-level detector means includes detector means for detecting closing.
Claim 4
Dependent Claim
21 words
The system according to claim 2 wherein the first limit detector means includes means for detecting output voltage of the battery.
Claim 5
Dependent Claim
21 words
The system according to claim 3 wherein the second limit detector means include means for detecting output voltage of the battery.
Claim 6
Dependent Claim
15 words
The system according to claim 4 wherein the first limit detector means includes a timer.
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) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |