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 |
| 7421782 | Method for manufacturing internal combustion engine piston A method is provided for efficiently manufacturing a high quality internal combustion engine piston having an annular cavity allowing for good circulation of cooling fluid. An annular groove is formed at the circumferential edge of the top face of a piston crown, or... | 09/09/2008 |
| 7219416 | Method of manufacturing a magnetic element The present invention provides a composite magnetic body containing metallic magnetic powder and thermosetting resin and having a packing ratio of the metallic magnetic powder of 65 vol % to 90 vol % and an electrical resistivity of at least 104 Ω·cm. W... | 05/22/2007 |
| 7134315 | Pulse radar level sensing gauge An improved pulse radar level sensing gauge for insertion into a storage or processing tank includes a housing; a probe cover comprising a sealing flange; and a probe for sensing electrical and mechanical properties, positioned at least partly below the sealing flan... | 11/14/2006 |
| 6003227 | Process for manufacturing a piston ring A process for manufacturing a molded piston ring for a piston in a piston-cylinder unit from a material which can be molded in a master mold. The surfaces of the piston in contact with the piston ring are provided with a separating agent which substantial... | 12/21/1999 |
| 5966807 | Manufacturing piston rings A method of manufacturing piston rings from a tube blank includes cutting a longitudinal slot in the tube blank, applying a force to the tube blank so that the slot is at least partially closed and the tube has a stressed shape, securing the stressed tube... | 10/19/1999 |
| 5461776 | Method of manufacturing piston rings A method for the manufacture of piston rings, includes the steps of producing a tube and machining the desired ring free shapes on the inner and outer diameters of the tube providing desired cross sectional profiles by grinding, for example, and then cutt... | 10/31/1995 |
| 5230149 | Method of manufacturing a hydraulic seal A method of manufacturing a ring-shaped hydraulic seal (10) produces a cylindrical sealing surface (12) having portions (24) formed of a plastic material and portions (26) formed of an elastomeric material. The method includes the steps of forming a plast... | 07/27/1993 |
| 4655983 | Piston rings and their manufacture A piston ring is formed by annular upper and lower parts which contact one another at respective surfaces normal to the axis of the piston ring. The parts can be injection moulded from thermoplastics materials with the parts themselves having no re-entran... | 04/07/1987 |
| 4537742 | Method for controlling dimensions of RSPD articles A method is provided for forming articles from difficult to fabricate materials with precise internal dimensions. The article is first formed to approximate dimensions as a body using the material in powdered form. Plasma spray forming is proposed. The po... | 08/27/1985 |
| 4100664 | Apex seal for rotary engines An improved seal for a rotary engine to reduce leakage at the rotor apex under normal operating temperatures. Opposite edges of the seal have differing coefficients of thermal expansion so that as the seal heats up, thermal expansion forces cancel the eff... | 07/18/1978 |
