Patent · US Active

Helical backup element

US8016295B2 · kind B2 · utility

56Cited by
15References
12Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 19, 2008
Grant dateSep 13, 2011
Priority date—
Expiry dateNov 22, 2028

Classification

  • Technology area (CPC E)Fixed Constructions
  • CPC primaryE21B33/1216
  • WIPO fieldCivil engineering
  • WIPO sectorOther fields

Abstract

A helical backup element includes a tubular body of material and a helical opening in the tubular body.

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