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. 07, 1992
Filed:
Apr. 18, 1991
Applicant:
Inventors:
Tetsuya Inui, Nara, JP;
Junji Hirokane, Nara, JP;
Akira Shibata, Nara, JP;
Yoshiyuki Nagahara, Nara, JP;
Kenji Ohta, Nara, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ; G11B / ; G01D / ;
U.S. Cl.
CPC ...
369280 ; 369284 ; 369286 ; 3692755 ; 3461351 ;
Abstract
An optical disk with a substrate made of glass at least partially has its inner and outer peripheral surfaces polished to surface roughness of 5 .mu.m or less so as to reduce the amount of glass powder generated from these surfaces and to thereby improve the yield.
Inui, Tetsuya. (1992). Optical disk with glass substrate and method of producing same (U.S. Patent No. 5128922). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5128922
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile