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| Number | Title | Issue Date |
| 4867803 | Lapping tools and method of manufacturing the same Spherical graphite cast iron utilized to prepare a lapping tool is manufactured by casting a molten composition into a mold cavity, and by chilling one side of the resulting casting thereby causing unidirectional solidification, the one side being used as... | 09/19/1989 |
| 4832084 | Dual graphite structured pipe This invention relates to a heavy wall monolithic iron pipe comprising nodular graphite in the outer portion of its wall and flake or quasi-flake graphite in the inner portion of its wall and a method for making said pipe. The central portion of the wall ... | 05/23/1989 |
| 4750945 | Castings made from aluminium and its alloys, whereof at least one face has at least one region of wear-resistant zones Castings made from aluminum and its alloys have at least one face including at least one region of wear-resistant zones. These castings are formed by a controlled distribution of zones hardened by local melting effect. The zones, no matter what their leng... | 06/14/1988 |
| 4729802 | Opener-disk heat-treating process and product A process for increasing surface hardness of a heat-hardenable steel disk, along an annular band intermediate the disk central and edge portions, is disclosed. The process contemplates selecting a first position on the surface of the intermediate annular ... | 03/08/1988 |
| 4617070 | Method of making wear-resistant cylinder, or cylinder liner surfaces In order to prevent the formation of fissures or tears in the walls of cylinders of an internal combustion engine, hardening tracks (4) generated by a carbon dioxide laser, are placed parallel to each other at an angle of inclination () with respec... | 10/14/1986 |
| 4476824 | Mechanical control element having wear-resistant surface Arrangement for providing an enhanced wear-resistant contact region for a cast iron mechanical control element such as a rocker arm. The control element is cast in a desired shape. It is then preheated to a temperature between room temperature and the Ms ... | 10/16/1984 |
| 4323401 | Bearing having an array of microasperities A bearing having a generally flat planer surface of pearlite, and an array of microasperities of martensite on the planer surface, each microasperity including a gently sloping front surface in relation to the direction of movement of the bearing and a sh... | 04/06/1982 |
