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. 03, 1999
Filed:
Mar. 11, 1998
Applicant:
Inventor:
Lloyd E Hackman, Ft. Myers, FL (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A63B / ;
U.S. Cl.
CPC ...
473319 ; 473323 ; 473409 ;
Abstract
A stepped golf club shaft with cylindrical segments joined by conical bands. The shaft is a composite with longitudinal and helical reinforcing fibers. The majority of the longitudinal fibers are located within the inner half of the shaft sidewall thickness, and the helical fibers are located within the outer half. A cutting tool is inserted into the bore of the hollow shaft and severs some of the longitudinal fibers to reduce the shaft stiffness, and therefore the natural frequency of oscillation, of the shaft.