Intermittent control device
Abstract
Abstract A WINDSHIELD WIPER CONTROL WHICH OPERATES THE WIPER BLADES CONTINUOUSLY OR INTERMITTENTLY WITH A DWELL PERIOD BETWEEN EACH WIPING CYCLE. IN THE INTERMITTENT OPERATION THE WIPER BLADES ARE RESPONSIVE TO THE CONDITION OF THE WINDSHIELD. TRANSISTORS ARE PROVIDED FOR CONTROLLING THE INTERMITTENT OPERATION AND ALSO FOR CONTROLLING THE CONTINUOUS MODE OF OPERATION. IN THE INTERMITTENT MODE OF OPERATION, THE TIME INTERVAL OF THE DWELL PERIODS CAN BE VARIED BETWEEN ZERO AND A PREDETERMINED MAXIMUM TIME INTERVAL SO THAT WHEN THE DWELL PERIODS ARE SET AT ZERO THE WIPER BLADES OPERATE CONTINUOUSLY. THE LENGTH OF TIME OF THE DWELL PERIODS IS DETERMINED BY A CAPACITIVE TIMING CONTROL IN WHICH THE CAPACITOR IS CHARGED BY THE BATTERY OF THE AUTOMOTIVE VEHICLE AND THEREAFTER IS CONNECTED IN AN RC CIRCUIT IN A MANNER TO APPLY TO THE RESISTANCE OF THE RC CIRCUIT A POTENTIAL GREATER THAN THE BATTERY VOLTAGE.
Inventors
- 👤 Robert W Kearns
Bibliographic Details
Claims Analysis
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |