Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 4676914 | Microprocessor based pump controller for backwashable filter A pump (B) pumps water from a swimming pool (A) to a forward/reverse direction control valve (D). The control valve (D) has a first or forward flow state in which it channels water into an inlet (20) of a filter (C) and from a filter outlet (24) back to t... | 06/30/1987 |
| 4505643 | Liquid pump control A circulating pump (B) pumps water between a swimming pool or other reservoir (A) and a filter or other circulated fluid receiving apparatus (C). A control circuit (D) intermittently operates the circulating pump. The operating circuit includes a first ti... | 03/19/1985 |
