US4347468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic variable speed automotive blower control system
Assignee: CLARK HEAVY CONSTRUCTION Inc
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Filing: 1980-04-28
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Granted: 1982-08-31
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Expires: 2000-04-28
Abstract
Abstract This is concerned with an electronic variable speed blower control system primarily used for automotive installations which provides light gauge wiring between a potentiometer on or in the dashboard and infinitely variable speeds are acquired in the blower unit.
Inventors
- 👤 Robert A. Wilke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:42
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
In a control for use with a blower motor in a heating and/or cooling system for a car or the like, a manually operable potentiometer to provide a variable voltage and adapted to be connected to the car battery, a circuit from the potentiometer including a power transistor adapted to be connected between the car battery and the blower motor, and being the only element that drops voltage therebetween, and a voltage comparator arranged to compare the voltage from the potentiometer to the output voltage from the power transistor including a transistor with its collector connected to ground and its emitter connected to the power transistor so as to turn on the power transistor if the potentiometer voltage is higher than the power transistor output voltage and to turn off the power transistor if the potentiometer voltage is lower than the power transistor output voltage.
Claim 2
Dependent Claim
145 words
In a control for use with a blower motor in a heating and/or cooling system for a car or the like, a manually operable potentiometer to provide a variable voltage and adapted to be connected to the car battery, a circuit from the potentiometer including a power transistor adapted to be connected between the car battery and the blower motor, and being the only element that drops voltage therebetween, and a voltage comparator arranged to compare the voltage from the potentiometer to the output voltage from the power transistor including a transistor with its collector connected to ground and its emitter connected to the power transistor so as to turn on the power transistor if the potentiometer voltage is higher than the power transistor output voltage and to turn off the power transistor if the potentiometer voltage is lower than the power transistor output voltage.
Claim 3
Dependent Claim
19 words
The control of claim 1 in which the circuit includes an amplifier between the potentiometer and the power transistor.
Claim 4
Dependent Claim
18 words
The control of claim 2 in which the amplifier includes a transient surge absorber for absorbing transient voltages.
Claim 5
Dependent Claim
16 words
The control of claim 2 in which the amplifier includes a stabilizer capacitance for preventing oscillations.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |