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:
Jul. 18, 2000
Filed:
Jun. 08, 1999
Applicant:
Inventors:
Isamu Kuribayashi, Tokyo, JP;
Hideki Hirata, Tokyo, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G01B / ;
U.S. Cl.
CPC ...
356426 ; 356385 ; 356384 ;
Abstract
A mechanical property such as axial acceleration of an injection molded resin disc substrate or an optical disc comprising the same is determined by measuring a variation in radius or diameter of the substrate or disc in its circumferential direction, and determining the mechanical property of the substrate or disc from the measurement.