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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Sugaya; Syoji
Address:
Nishinomiya, JP
No. of patents:
2
Patents:












Patent Number Title Of Patent Date Issued
4903255 Optical recording disc February 20, 1990
An optical recording disc, such as a compact disc, having a non-playback side including a write-in region available for adding a message or an illustration so that it can be provided with such one and only design as each individual consumer may desire and it is suitable for a gift.
4891800 Optical recording disc January 2, 1990
An optical recording disc provided with a substrate permeable to a red laser beam for reading data recorded and having a single pass transmissivity of 85% or more in a wave length region of said laser beam and a light absorption edge of shorter wave length side positioned at 600 nm o










 
 
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