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. 31, 1989
Filed:
Oct. 01, 1987
Eishi Koike, Sagamihara, JP;
Ozen Corporation, Tokyo, JP;
Abstract
A speed of movement of a moving object, e.g., a tennis ball, which moves a predetermined distance is determined by measuring a time interval between a first detection of a vibration wave produced in the ball when it is hit by the tennis player's racket and a second detection of anouther vibration wave produced when the ball collides with the court surface. A vibration sensor for performing the first detection, and a microcomputer for computing the movement speed of the ball, and a liquid crystal display for displaying the movement speed are accommodated in a case which is mounted on the tennis racket. A sound collecting micrphone which performs the second detection is attached to the lower edge of the net near a ball landing position on the court, and the detection signal is transmitted over a radiowave to a receiver accommodated in the case.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile