Patent 4433340 Issued on February 21, 1984. Estimated Expiration Date: March 22, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
346/135.1, Laminated, impregnated, or coated bases347/264, With record receiver or handling means therefor369/286, Laminated or unified discrete layers430/270.12, Having read-write layer of 100 per cent inorganic composition430/348, THERMOGRAPHIC PROCESS430/945, LASER BEAM430/964THERMAL IMAGING COMPOSITION
Disclosed is an optical recording medium. This optical recording medium has a substrate made of a transparent material such as an acrylic resin; and a recording layer for receiving an energy beam such as a laser beam whose intensity is changed in response to quantized information and for receiving desired information by melt-deforming in response to the intensity of the energy beam. The recording layer contains tellurium as a base material and carbon at a predetermined content of 40 atomic percent.
Densi Tsushin Gakkai, Densi Buhin Zairyo Kenkyukai (CPM80-71); Y. Asano et al.; (Nov. 1980)