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:
Oct. 31, 1995
Filed:
Mar. 08, 1994
Applicant:
Inventor:
Masanori Takatsuka, Shizuoka, JP;
Assignee:
Yamaha Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A63B / ;
U.S. Cl.
CPC ...
273 / ;
Abstract
A tennis racket has longitudinal strings stretched in a longitudinal direction between a frame top and a grid end and transversal strings stretched in a transversal direction perpendicular to the longitudinal direction, and a ratio of a tensile force exerted on each longitudinal string to a tensile force exerted on each transversal string ranges from 2.5:1 to 4.0:1 so that a nodal line for vibrations in the secondary mode passes through a sweet area, thereby decreasing a reaction from the tennis racket at an impact against a tennis ball.
Quick Actions:
Takatsuka, Masanori. (1995). Tennis racket with longitudinal strings different in tensile force from (U.S. Patent No. 5462274). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5462274
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