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:
Nov. 21, 2006
Filed:
Dec. 10, 2003
Susumu Uehara, Sagamihara, JP;
Susumu Uehara, Sagamihara, JP;
Kabushiki Kaisha Ohara, Sagamihara, JP;
Abstract
An optical glass has optical constants which are an refractive index (nd) of 1.70–1.75 and an Abbe number (vd) of 45.0–54.0; a glass transformation temperature (Tg) of 500–580° C. The glass has the following composition in mass percent of: SiOmore than 5–15%; BO20-less than 30%; a total amount of SiO+BOmore than 25–40%; LaOmore than 21-less than 30%; YOmore than 5–15%; GdO0-less than 10%; ZrO1–8%; NbO0.1–5%; TaOmore than 5–12%; a total amount of ZrO+NbO+TaO7–20%; ZnO 0–10%; CaO 0–10%; SrO 0–5%; BaO 0–10%; a total amount of ZnO+CaO+SrO+BaO 5–15%; LiO 1–8%; SbO0–1%; and AsO0–1%. The glass is substantially free of YbOand AlO. Devitrification is not generated when the optical glass is kept at a temperature of 920° C. for two hours.