Patent · US Expired

Variable injector

US5890534A · kind A · utility

34Cited by
32References
16Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 25, 1997
Grant dateApr 6, 1999
Priority date—
Expiry dateSep 25, 2017

Classification

  • Technology area (CPC E)Fixed Constructions
  • CPC primaryE21B19/22
  • WIPO fieldCivil engineering
  • WIPO sectorOther fields

Abstract

Apparatus for handling pipe, coiled tubing, casing, and conventional tubing in well drilling and servicing operations.

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