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. 29, 1988
Filed:
May. 06, 1987
Applicant:
Inventors:
Gerald A Pierce, Redwood City, CA (US);
James L Buxton, East Palo Alto, CA (US);
Assignee:
Drexler Technology Corporation, Mountain View, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
235454 ; 235487 ;
Abstract
An optical data read-only card and system using a length of optical recording material in which data in the form of microscopic spots is disposed in cells forming a regularly spaced grid. The spots contrast with the background media with a reflective contrast ratio of at least 1.5 to 1. While the material is being moved in a lengthwise direction by a transport, rows of cells are being read one row at a time by a linear CCD array capable of detecting the contrasting reflectivities between spots and background.