US5291109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Windshield wiper system
Assignee: Robert Bosch GmbH
•
Filing: 1991-03-11
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Granted: 1994-03-01
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Expires: 2011-03-11
Abstract
Abstract A windshield wiper system (10) which includes an electrical drive motor (12) that makes available a driving moment for at least one windshield wiper (16) performing a back and forth movement on a pane to be cleaned. A signal processing arrangement (20) is provided which, by way of an electrical switching stage (18), controls or regulates the rotation rate of the drive motor (12) to a constant value.
Inventors
- 👤 Cornelius Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:19
CPC Classifications
B; B60; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/06; B60S1/08; Y; Y10; Y10S; Y10S318/00; Y10S318/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A windshield wiper system comprising at least one electrical drive motor that makes available a driving moment for at least one windshield wiper performing a back and forth movement on a pane to be cleaned, and a signal processing arrangement which by way of an electrical switching stage controls the rotation rate of the motor to a constant value, said switching stage determining the operating voltage of the motor as a function of the current flowing through the motor.
Claim 2
Dependent Claim
79 words
A windshield wiper system comprising at least one electrical drive motor that makes available a driving moment for at least one windshield wiper performing a back and forth movement on a pane to be cleaned, and a signal processing arrangement which by way of an electrical switching stage controls the rotation rate of the motor to a constant value, said switching stage determining the operating voltage of the motor as a function of the current flowing through the motor.
Claim 3
Dependent Claim
25 words
A system according to claim 1, wherein the current flowing through the motor is determined by way of the voltage drop occurring across a resistor.
Claim 4
Dependent Claim
17 words
A system according to claim 2, wherein the resistor is thermally coupled with the electrical drive motor.
Claim 5
Dependent Claim
29 words
A system according to claim 1, further comprising means for detecting the operating temperature of the motor so as to put out a signal to the signal processing arrangement.
Claim 6
Dependent Claim
28 words
A system according to claim 1, further comprising an operating element for preselecting at least two different wiping speeds and the operating mode of the windshield wiper system.
Claim 7
Dependent Claim
29 words
A system according to claim 1, further comprising an additional switching stage for permitting emergency operation of the windshield wiper system upon a malfunction of the first-mentioned switching stage.
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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) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |