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:
Jul. 21, 2009
Filed:
Nov. 08, 2005
Applicant:
Susumu Uehara, Kanagawa, JP;
Inventor:
Susumu Uehara, Kanagawa, JP;
Assignee:
Kabushiki Kaisha Ohara, Sagamihara-Shi, Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C 3/068 (2006.01);
U.S. Cl.
CPC ...
Abstract
An optical glass has a low glass transition temperature (Tg) and optical constants in which a refractive index (n) is in the range of from 1.70 to less than 1.74 and an Abbe number (ν) is between 40 and 45 (excluding 40 and 45), has a content of SiOis 17% by mass or less, a glass transition temperature (Tg) is 540° C. or less, and a weathering resistance (surface-method) in Class 1 or 2, and has excellent chemical durability, particularly weathering resistance (surface-method) and is appropriate for precision mold press forming.