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:
Apr. 30, 2013
Filed:
Oct. 12, 2009
Applicant:
Hiroyuki Yuuki, Utsunomiya, JP;
Inventor:
Hiroyuki Yuuki, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 27/54 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides a projection optical system for projecting a pattern of an object plane onto an image plane, including a first lens whose refractive index irreversibly increases by ultraviolet irradiation, and a second lens whose refractive index irreversibly decreases by the ultraviolet irradiation.
Yuuki, Hiroyuki. (2013). Projection optical system with rarefaction compensation (U.S. Patent No. 8432532). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/8432532
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