Patent · US Expired

Method of heat treating valve inserts

US4643781A · kind A · utility

4Cited by
7References
1Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 10, 1985
Grant dateFeb 17, 1987
Priority date—
Expiry dateMay 10, 2005

Classification

  • Technology area (CPC F)Mechanical Engineering; Lighting; Heating
  • CPC primaryF01L3/22
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

An induction hardened valve seat insert is provided with a ridged outer surface which establishes a mechanically locked engagement with the wall of the insert bore during the induction heating cycle.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.