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:
Oct. 25, 1988
Filed:
Oct. 02, 1986
Michael A Lind, Durham, OR (US);
W Eugene Skiens, Wilsonville, OR (US);
Clyde D Feyrer, Portland, OR (US);
Geoffrey A Russell, Beaverton, OR (US);
Optical Data, Inc., Portland, OR (US);
Abstract
An erasable optical data storage medium has a polymer dual recording layer including an expansion layer bonded to a retention layer, each of the layers dyed to selectively absorb light in respective narrow wavelength bands. The retention layer has a glass transition temperature substantially above the glass transition temperature of the expansion layer, and is capable of undergoing substantial viscoelastic shear deformation while below its glass transition temperature. A first laser beam heats the expansion layer causing it to expand and cause viscoelastic deformation in the retention layer while the retention layer is below its glass transition temperature. A second laser beam is used to heat the retention layer above its glass transition temperature and relax the deformation, erasing the medium.