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 |
| 4378523 | Metering and control system A metering and control system is provided which in one embodiment provides a continuous reading vacuum gage and a controller for activating relays when the vacuum pressures indicated by the gage pass through one or more set points. The controller comprise... | 03/29/1983 |
| 4270727 | Spring loaded plug valve A valve is provided which includes a poppet enclosed in a plug of plastic material, such as Teflon, and which is biased against a seat by a compression spring so that a positive seal is provided even in the presence of cold flow in the plastic plug. A val... | 06/02/1981 |
| 4238111 | Gate valve for use with vacuum equipment A gate valve is provided for use in conjunction with vacuum equipment in which a gate assembly is opened and closed, for example, by a pneumatic cylinder. The gate assembly is enclosed in a valve housing, and aligned openings are provided in the opposite ... | 12/09/1980 |
| 4237920 | Spring loaded plug valve A valve is provided which includes a poppet enclosed in a plug of plastic material, such as Teflon, and which is biased against a seat by a compression spring so that a positive seal is provided even in the presence of cold flow in the plastic plug. A val... | 12/09/1980 |
| 4157169 | Fluid operated gate valve for use with vacuum equipment A gate valve for use with vacuum equipment is provided in which a gate assembly is opened and closed by a fluid operated device, such as a pneumatic cylinder. The gate assembly is enclosed in a valve housing. The valve housing has aligned openings therein... | 06/05/1979 |
