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. 08, 1988
Filed:
May. 16, 1986
Applicant:
Inventors:
Hanphire H Nee, Stamford, CT (US);
Vasil D Tasi, Stamford, CT (US);
Assignee:
CBS Inc., New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430323 ; 430329 ; 430397 ; 430945 ; 346 / ; 2041296 ; 20412965 ; 20412995 ;
Abstract
For manufacturing a master for the replication of optical discs a plate of fine-grained copper is coated with a photoresist and exposed by a laser beam which is turned on and off in accordance with information to be recorded on the disc. After developing the photoresist, the exposed portions of the copper layer is etched to a predetermined depth and the photoresist stripped from the etched copper surface.