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. 17, 1992
Filed:
Jul. 02, 1990
Dainippon Ink and Chemicals Inc., Tokyo, JP;
NKK Corporation, Tokyo, JP;
Abstract
An optical recording medium of the type whereby information is recorded and reproduced by utilizing a change of the reflectance of an irradiated portion, caused by irradiating a recording film formed on a substrate with laser beams is described. The recording film in this optical recording medium has a three-layer structure comprised of a layer containing at least tin and selenium and layers of a passive state-forming metal or an oxide thereof, contiguous to both sides of said layer containing tin and selenium. A film of a phthalocyanine compound having a light transmission of at least 80% at a wavelength of 770 to 850 nm is disposed between the recording film and the substrate.