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:
May. 17, 1994
Filed:
Jan. 19, 1993
Jean Ledieu, Crespieres, FR;
Jean-Francois Dufresne, Caen, FR;
Digipress, Caen Cedex, FR;
Abstract
An optical disk die is manufacture from a laminated disk which includes a substrate, an overlying heat sensitive layer, a reflective layer, and a final output protective layer. A laser beam forms micro-pits in the heat sensitive layer. These micro-pits become exposed after removal of the protective and reflective layers. A thin metallic coating is deposited over the surface of the pitted heat sensitive layer wherein the contours of the micro-pits are followed. A thicker second metallic layer is deposited over the first metallic layer and has an interface with the first metallic layer which duplicates a pattern of the micro-pits. Finally, the deposited second layer is separated from the remainder of the laminated disk thereby forming a die having the micro-pit pattern therein.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile