Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yoshihisa Suda0
Kunitaka Yamada0
Atsunori Satake0
Kaoru Kato0
Hiroko Kaneko0
Date of Patent
September 4, 2007
Patent Application Number
10971702
Date Filed
October 25, 2004
Patent Primary Examiner
Patent abstract
The invention provides at a relatively low cost a carbon substrate that is formed from an opaque material and that has an extremely flat surface so that optical measurements can be made on the substrate. Graphite powder with a particle size of 10 μm or less is mixed in a thermosetting resin such as a furan resin, and the mixture is molded into a sheet and calcined at 1400° C. in an inert atmosphere to produce a carbon substrate whose surface is then ground flat.
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