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. 27, 1988
Filed:
Jul. 17, 1987
Applicant:
Inventor:
Jeffrey A Giacomel, Arlington, TX (US);
Assignee:
LTV Aerospace and Defense Company, Dallas, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
369100 ; 369284 ; 369286 ; 365113 ; 365114 ; 365127 ; 346137 ;
Abstract
A portion of a chalcogenide transformation film in a less reflective phase responds to a low energy laser beam writing pulse by transforming to a crystalline phase. A marmem alloy, secured to the bottom side of the film, responds to a longer erasing pulse of a lower energy laser beam at the same portion by physically stressing the film only at that same portion. The film portion responds to the physical stress by transforming back to a less reflective phase. An optical reader interprets the crystalline phase as a digital logic '1', and the less reflective phase as a digital logic '0'.