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. 09, 2000
Filed:
Mar. 18, 1998
Applicant:
Inventors:
Masaki Shiozawa, Sagamihara, JP;
Tsutomu Mizugaki, Matsudo, JP;
Shigeru Sakuma, Chigasaki, JP;
Norio Komine, Sagamihara, JP;
Seishi Fujiwara, Sagamihara, JP;
Hiroki Jinbo, Yokohama, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G02B / ; F21V / ;
U.S. Cl.
CPC ...
359361 ; 359350 ; 359355 ; 355 53 ;
Abstract
An optical member is provided for use in an image-focusing optical system for guiding light having a wavelength shorter than about 300 nm. The optical member includes a calcium fluoride crystal having a sodium concentration of less than about 0.2 ppm.