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:
Aug. 31, 2004
Filed:
Jul. 12, 2002
Applicant:
Inventors:
Masaaki Otsuka, Saitama-ken, JP;
Yoshinori Yamamoto, Saitama-ken, JP;
Koichi Tsuchiya, Saitama-ken, JP;
Naruhito Sawanobori, Saitama-ken, JP;
Shinobu Nagahama, Saitama-ken, JP;
Assignee:
Sumita Optical Glass, Inc., Saitama-ken, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C 3/17 ;
U.S. Cl.
CPC ...
C03C 3/17 ;
Abstract
The present invention provides an optical glass for press molding, in particular, a low softening point glass which contains, in an oxide glass of phosphate type, a durability improving component in addition to glass forming components, and has a weight loss of at most 0.15 weight % in a durability test, and which is represented, in term of elements for making up the glass, by the following chemical composition (mol %):