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:
Sep. 18, 1990
Filed:
Oct. 23, 1989
Michael E Hennessey, Detroit, MI (US);
Producers Color Service, Inc., Southfield, MI (US);
Abstract
A method of making an optical memory disc replica that includes the steps of injection molding a PMMA substrate having a surface with information recorded thereon as a series of surface undulations, and depositing a film of optically reflective metallic construction over the information surface such that the information recorded on the surface may be optically read through the substrate as a function of reflectivity from the film. The reflective film is sputter-deposited onto the information surface in the presence of carbon at said surface in excess of that in the polymer molecular structure by subjecting the surface to a plasma that includes carbon-rich ions to prepare the surface for chemical bonding with the metal of the film and the underlying substrate.