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:
Jan. 22, 2002
Filed:
Mar. 15, 2000
Yoshihisa Usami, Odawara, JP;
Michihiro Shibata, Odawara, JP;
Noboru Komori, Odawara, JP;
Toshio Ishida, Odawara, JP;
Takashi Morohashi, Hamura, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
An optical information recording disc such as CD-R or DVD-R is composed of a transparent disc substrate provided with a spiral pregroove, a recording dye layer, placed in the pregroove, and a light-reflecting layer, wherein the pregroove formed in the area between an inner circle having a radius corresponding a half of a radius of the disc substrate and an outer circle having a radius corresponding 19/20 of the radius of the disc substrate has a radiused top corner at least one side, under the condition that the radius of the radiused corner on the outer circle is more generous than the radius of the radiused corner on the inner circle.