The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 30, 1982
Filed:
Aug. 07, 1979
Walther Hiller, Puchheim, DE;
Steigerwald Strahltechnik GmbH, Puchheim, DE;
Abstract
A piston made of an aluminum alloy has at least one piston ring groove defined by two side walls and a bottom wall. At least one preferably both side walls of the piston ring groove(s) are formed or defined by a zone, which has been hardened by an energy beam remelting process. The remelted zone may comprise alloy elements other than or more concentrated than the alloy elements comprised in the other portion of the piston, said additional alloy elements being introduced into said zone in the course of the remelting process. Each piston ring groove side wall may be formed by an individual remelted zone, or both sidewalls of a piston ring groove may be formed by the same remelted zone. The additional alloy elements may be applied in the form of a layer or a wire to the location of the surface of the piston, where subsequently a remelted zone is formed by the energy beam. The energy beam is preferably an electron beam, however, ion and laser beams may also be used.