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:
Mar. 03, 2009
Filed:
May. 16, 2005
Rumiko Hayase, Yokohama, JP;
Akiko Hirao, Chiba, JP;
Kazuki Matsumoto, Kawasaki, JP;
Takayuki Tsukamoto, Kawasaki, JP;
Urara Ichihara, Legal Representative, Yokohama, JP;
Rumiko Hayase, Yokohama, JP;
Akiko Hirao, Chiba, JP;
Kazuki Matsumoto, Kawasaki, JP;
Takayuki Tsukamoto, Kawasaki, JP;
Urara Ichihara, legal representative, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
Disclosed is a holographic recording medium and methods of manufacturing the holographic recording medium. The example of the medium has a recording layer containing a three dimensionally cross-linked polymer matrix including an epoxy resin, a radically polymerizable monomer, and a photo radical polymerization initiator. The radically polymerizable monomer comprises both N-vinylcarbazole (VC) and N-vinylpyrrolidone (VP) or N-vinylcarbazole alone. The weight ratio of N-vinylcarbazole (VC) to the sum of N-vinylcarbazole (VC) and N-vinylpyrrolidone (VP), i.e., (VC/(VC+VP)), is not smaller than 0.75 and not larger than 1.0.