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:
Aug. 26, 2008
Filed:
Oct. 25, 2005
Applicant:
Espen Hiorth, Trondheim, NO;
Inventor:
Espen Hiorth, Trondheim, NO;
Assignee:
Bronnteknologiutvikling AS, Trondheim, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 33/012 (2006.01);
U.S. Cl.
CPC ...
Abstract
A reinforcement ring, includes an annular coil spring with a core unit arranged inside to prevent deforming or twisting of the ring under load. The core unit is formed from a chain of interlinked elements, each having a male part and a female part; the male parts of each element being engaged with corresponding female parts of an adjoining element.