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:
Sep. 04, 2007
Filed:
Oct. 25, 2004
Yoshihisa Suda, Fujioka, JP;
Atsunori Satake, Fujioka, JP;
Kunitaka Yamada, Fujioka, JP;
Hiroko Kaneko, Tsukuba, JP;
Kaoru Kato, Tsukuba, JP;
Yoshihisa Suda, Fujioka, JP;
Atsunori Satake, Fujioka, JP;
Kunitaka Yamada, Fujioka, JP;
Hiroko Kaneko, Tsukuba, JP;
Kaoru Kato, Tsukuba, JP;
Mitsubishi Pencil Co., Ltd., Tokyo, JP;
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.