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 |
| 5676872 | Flexible heating element having a layer of fixing varnish A heating element has a flat, flexible strip of electrically insulating material around which is wound a conductor wire. A layer of fixing varnish covers the turns of the conductor wire and the flat strip. Two clips attached to the ends of the strip provi... | 10/14/1997 |
| 5138221 | Inorganically insulated heater, and cathode ray tube and air flow sensor using the same The present invention relates to an inorganically insulated heater having a long life for use in air flow sensors, cathode ray tube cathode heaters etc., wherein the distribution of inorganic insulating particles of the whole insulating layer is made unif... | 08/11/1992 |
| 4800359 | Winding of noise suppressing high tension resistive electrical wire A winding of noise suppressing high tension resistive electrical wire is disclosed which comprises a reinforcing fiber cord bound by immersion in a low-viscosity liquid resin binder, an elastomeric coating layer formed on a surface of the fiber cord by ap... | 01/24/1989 |
| 4621251 | Electric resistance heater assembly An improved electric resistance heater assembly for soldering tools, glue guns, hair dryers, heat pencils, paint removers, etc., includes, as the core of the assembly, an open-ended tube of a ceramic material having good electrical insulation properties w... | 11/04/1986 |
| 4438322 | Ceramic coated electric heater assembly for tools An electric heater assembly for tools having a removable heated tip includes a tubular metal base having an open end adapted to removably receive and hold the end of the tool tip. A coating of ceramic electrical insulation material is provided on a portio... | 03/20/1984 |
| 4272673 | Heating element A heating element is comprised of [A] a shaped, electrically insulating substrate, said substrate including a reinforced polyimide composite, [B] a continuous, electric resistor element in entwining relationship with, and at least partially inlain within ... | 06/09/1981 |
| 4229972 | Methods of and/or means for indicating the levels of liquids A wire wound resistor is vertically disposed in a vessel. The resistor has a former of between 20 mm and 45 mm diameter and resistance wire of a resistance of between 1 and 4 ohms per turn connected in the circuit of an A.C. bridge circuit. Impedance chan... | 10/28/1980 |
| 3970816 | Electric heater for heating lubricating oils An oil heater for heating lubricating oils having infrared energy absorbtion peaks within infrared wavelengths ranging from 2.5 to at least 15 microns comprises an electrical infrared heating element coupled to an oil cock and adapted to contact the oil w... | 07/20/1976 |
| 3939557 | Method of making resistance thermometer sensors A resistance thermometer sensor is provided by forming a path of electrically conducting material secured on an insulating base. The path is shaped as a loop having two side-by-side portions. A shorting bar connecting across these portions to short circui... | 02/24/1976 |
