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:
Apr. 22, 2014
Filed:
Mar. 28, 2007
Xuelu Zou, Shinjuku-ku, JP;
Yasuhiro Fujiwara, Shinjuku-ku, JP;
Hiroshi Kohno, Shinjuku-ku, JP;
Kohichiro Shiraishi, Shinjuku-ku, JP;
Xuelu Zou, Shinjuku-ku, JP;
Yasuhiro Fujiwara, Shinjuku-ku, JP;
Hiroshi Kohno, Shinjuku-ku, JP;
Kohichiro Shiraishi, Shinjuku-ku, JP;
Hoya Corporation, Tokyo, JP;
Abstract
A glass material for mold pressing, comprised of a core portion and a covering portion. In one embodiment, the core portion comprises a multicomponent optical glass containing at least one readily reducible component selected from among W, Ti, Bi, and Nb and the covering portion comprises a multicomponent glass containing none or a lower quantity of the readily reducible component than is contained in the core portion. In another embodiment, the core portion comprises a fluorine-containing multicomponent optical glass, and the covering portion comprises a multicomponent glass containing none or a lower quantity of fluorine than is contained in the core portion. A method for manufacturing an optical glass element employing the above glass material that comprises heat softening a glass material that has been preformed into a prescribed shape, and conducting press molding with a pressing mold.