US4495452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Windshield wiper control having a sensor and a repeatedly renewed offset signal
Assignee: Leopold Kostal GmbH and Co KG
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Filing: 1982-12-07
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Granted: 1985-01-22
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Expires: 2002-12-07
Abstract
Abstract A windshield wiper control, e.g. for use in automobiles, receives information as to the amount of humidity on the windshield from a sensor (1) which is arranged within the area which is swept by the windshield wipers, and adjust the wiper frequency in relation thereto. The windshield wiper control includes a circuit (2) which remembers the signal from the sensor just after the windshield wiper has passed the sensor. The signal is compared to the signal directly from the sensor by a comparator (3). Having detected a certain change, the amplifier (4) is activated which turns on the wiper motor through a relay (5). The sensor may be of the capacitive type.
Inventors
- 👤 Allan Boegh-Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:21
CPC Classifications
B; B60; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/06; B60S1/08; B60S1/0818; B60S1/0822; B60S1/0825; Y; Y10; Y10S; Y10S15/00; Y10S15/15; Y10S318/00; Y10S318/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A windshield wiper control systems for automatic operation based upon the presence on a windshield of a predetermined amount of moisture, including a wiper, a motor for driving the wiper, a moisture sensor arranged within the area swept by the wiper, a reference store connected to the output of the sensor, a reference signal stored in said store, and means to compare the sensor output signal to said reference signal so that the motor is activated when the moisture amount exceeds the amount of the reference signal, so that each time the wiper has just passed the sensor, the sensor output signal is written to the store and is retained as a reference at the next comparison, and circuit means allowing said reference signal to continuously follow slow changes of the signal from the sensor.
Claim 2
Dependent Claim
135 words
A windshield wiper control systems for automatic operation based upon the presence on a windshield of a predetermined amount of moisture, including a wiper, a motor for driving the wiper, a moisture sensor arranged within the area swept by the wiper, a reference store connected to the output of the sensor, a reference signal stored in said store, and means to compare the sensor output signal to said reference signal so that the motor is activated when the moisture amount exceeds the amount of the reference signal, so that each time the wiper has just passed the sensor, the sensor output signal is written to the store and is retained as a reference at the next comparison, and circuit means allowing said reference signal to continuously follow slow changes of the signal from the sensor.
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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) | 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 |