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:
Mar. 22, 1988
Filed:
Feb. 13, 1985
Applicant:
Inventors:
Minemasa Ota, Saitama, JP;
Osamu Kumasaka, Saitama, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430322 ; 430323 ; 430325 ; 430327 ; 430394 ; 430945 ; 346 / ;
Abstract
A method for manufacturing an optical disk having both address pits and guide grooves having accurately controlled depths and widths. Two different types of sensitive materials of different characteristics are applied to a recording original board to form inner and outer layers thereon. The inner and outer layers are exposed and partially removed independently of each other so that the depth and width of the guide grooves and address pits can be set to desired values with high accuracy.
Ota, Minemasa. (1988). Method for manufacturing optical disk with address and guide grooves (U.S. Patent No. 4732844). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4732844
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile