Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Reexamination Certificate
2005-10-04
2008-10-21
Mulvaney, Elizabeth (Department: 1794)
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
C428S064500, C428S064600, C430S270130
Reexamination Certificate
active
07438965
ABSTRACT:
It is an object of the present invention to provide a phase-change information recording medium, and the like, which is easy to perform initial crystallization, exhibits good recording sensitivity at a linear velocity as high as 10 double speeds or more with as much capacity as DVD-ROM, is capable of overwrite recording and has good storage reliability. For this purpose, the phase-change information recording medium comprises a substrate and at least a first protective layer, a phase-change recording layer, a second protective layer, and a reflective layer disposed on the substrate in one of this sequence and reverse sequence wherein the phase-change recording layer comprises a composition expressed by SnαSbβGaγGeδTeε−Xζ(In this regard, X represents at lease one element selected from Ag, Zn, In and Cu. α, β, γ, δ, ε and ζ represent composition ratio (atomic percent) of each element and are expressed as 5≦α≦25, 40≦β≦91, 2≦γ≦20, 2≦δ≦20, 0≦ε≦10, 0≦ζ≦10 and α+β+γ+δ+ε+ζ=100).
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Taiwan Patent Office, Communication dated May 16, 2008, in Taiwan Patent Application No. 093123518 (Ricoh Company, Ltd.).
Abe Mikiko
Deguchi Hiroshi
Harigaya Makoto
Ito Kazunori
Kato Masaki
Cooper & Dunham LLP
Mulvaney Elizabeth
Ricoh & Company, Ltd.
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