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:
Nov. 29, 1988
Filed:
Nov. 28, 1986
Eric W Bouldin, Atherton, CA (US);
Jerome Drexler, Los Altos Hills, CA (US);
Drexler Technology Corporation, Mountain View, CA (US);
Abstract
A medium in tape form for laser recorded optical information featuring a gelatin layer having a thin black crust at the top of the layer. The crust is formed by developed black filamentary silver particles within the top 0.5 micron of a gelatin colloid matrix. The remainder of the colloid matrix is substantially clear gelatin and a reflective metallic layer is disposed below the gelatin. The tape may be disposed on reels and may be pre-patterned during formation of the crust with indicia, such as servo track guides or timing marks. User data may be recorded by modification or by displacing the black silver particles in the crust with a laser to expose the reflective underlayer. A laser or other light source is used to read data on the medium with optical contrast between the black surface and the reflective metallic layer underlying the gelatin layer which can be observed in the recorded spots.