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:
Dec. 25, 2001
Filed:
Aug. 09, 2000
Applicant:
Inventors:
Koji Nakahata, Saitama-ken, JP;
Koichi Tsuchiya, Saitama-ken, JP;
Shinobu Nagahama, Saitama-ken, JP;
Assignee:
Sumita Optical Glass, Inc., Saitama-Ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C 3/14 ; C03C 3/16 ; C03C 3/19 ; C03C 3/21 ;
U.S. Cl.
CPC ...
C03C 3/14 ; C03C 3/16 ; C03C 3/19 ; C03C 3/21 ;
Abstract
The present invention provides an optical glass for precision molding, having excellent properties, i.e. yield temperature (At) of at most 550° C., refractive index (nd) of at least 1.83 and Abbe number (&ngr;d) of at most 26.0 and further providing a low softening property as well as an improved mass production property with less coloration, which is represented, in term of atoms for making up the glass, by the following chemical composition (wt %)