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. 02, 1991
Filed:
Mar. 16, 1990
Applicant:
Inventors:
Nobusuke Yamada, Machida, JP;
Koji Tsukuma, Atsugi, JP;
Tetsuo Fujii, Yamato, JP;
Hideaki Segawa, Yokohama, JP;
Shinichi Kondo, Yokohama, JP;
Keishi Honta, Zama, JP;
Assignee:
Tosoh Corporation, Shinnanyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350-12 ; 350475 ; 372101 ;
Abstract
An achromatic lens for ultraviolet rays constituted by (A) high-purity silica glass having a purity of 99.9% or more, or fluorine-containing, high-purity silica glass having a purity of 99.9% or more; and (B) silica glass containing germanium dioxide or silica glass containing germanium dioxide and boron oxide.