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:
Jan. 10, 1995
Filed:
Apr. 11, 1994
Yasushi Taniguchi, Kawasaki, JP;
Keiji Hirabayashi, Tokyo, JP;
Keiko Ikoma, Yokohama, JP;
Noriko Kurihara, Tokyo, JP;
Masaaki Matsushima, Yokohama, JP;
Kiyoshi Yamamoto, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A diamond sintered product having diamond particles sintered with a suitable sintering aid is the most suitable as the material for the mold for optical element molding, because it has in combination the advantage of diamond that no fusion with glass at high temperature occurs and oxidation occurs with difficulty to give rise to no precipitation of lead, an appropriate hardness and also the advantage that mirror polishing is possible. 'There is also disclosed a mold which has a diamond layer having a (100) face, made by the CVD method utilizing gas having 1-3% methane in hydrogen.'