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:
Jan. 17, 2023
Filed:
Dec. 17, 2019
Agc Inc., Tokyo, JP;
Shinichi Amma, Tokyo, JP;
Tatsuo Nagashima, Tokyo, JP;
AGC INC., Tokyo, JP;
Abstract
An optical glass has a refractive index (n) of 1.64 or more. A P value represented by the following formula (1) is in a range of 7.0<P value<10.0: P value=log(A×P+A×P+A×P+A×P) (1). A, A, Aand Aare absorbances of the optical glass with a plate thickness of 10 mm at a wavelength of 450 nm, 550 nm, 650 nm and 750 nm, respectively. P, P, Pand Pare radiances of light having a wavelength of 450 nm, 550 nm, 650 nm and 750 nm, respectively, at 1,300° C. according to Planck's radiation law. All of internal transmittances in terms of a 10-mm thickness at wavelengths of 450 nm, 550 nm, 650 nm and 750 nm are 91% or more.