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:
Jan. 19, 1988
Filed:
Dec. 30, 1985
Applicant:
Inventor:
Otmar M Ulbing, Fairport, NY (US);
Assignee:
Windwinder Corporation, Tipp City, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21F / ;
U.S. Cl.
CPC ...
29173 ; 72145 ; 72371 ; 140 89 ;
Abstract
A closely wound, coil type tension spring of one hand having an initial tension exceeding that obtainable by prior spring forming techniques is formed by reverse winding an open-wound compression spring of the opposite hand. Alternative methods and apparatus for forming the tension spring are disclosed.