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:
May. 12, 2026
Filed:
Jun. 16, 2023
Applicant:
Nikon Corporation, Tokyo, JP;
Inventors:
Mariko Hirayama, Tokyo, JP;
Hitoshi Ishizawa, Kawasaki, JP;
Takuro Nakamura, Yamato, JP;
Yoshinobu Ezura, Yokohama, JP;
Yuya Yamamoto, Machida, JP;
Assignee:
NIKON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 1/02 (2006.01); G02B 7/14 (2021.01);
U.S. Cl.
CPC ...
G02B 1/02 (2013.01); G02B 7/14 (2013.01);
Abstract
A calcium fluoride polycrystalline substance, in which the internal transmittance of light having a wavelength of 550 nm per thickness of 10 mm is 98% or more.