Patent · US Expired

Stress relieved tool elements

US4076436A · kind A · utility

22Cited by
4References
6Claims
0Family size

Assignee

Inventors

Key dates

Filing dateFeb 5, 1976
Grant dateFeb 28, 1978
Priority date—
Expiry dateFeb 5, 1996

Classification

  • Technology area (CPC F)Mechanical Engineering; Lighting; Heating
  • CPC primaryF16B7/182
  • WIPO fieldCivil engineering
  • WIPO sectorOther fields

Abstract

Specially designed stress relief grooves for threaded end portions of tools and for collars on reciprocating or rotating drill string mounted tools.

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