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:
Jun. 06, 2006
Filed:
May. 14, 2004
Applicant:
Haruna Kawashima, Tochigi, JP;
Inventor:
Haruna Kawashima, Tochigi, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 1/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
A projection optical system that projects a pattern on a first surface onto a second surface, and has a numerical aperture of 0.85 or higher includes an optical element, and an antireflection coating applied to the optical element, the antireflection coating including plural layers, an end layer having a refractive index of tan { sin(NA)} or greater, where NA is the numerical aperture of the projection optical system.
Kawashima, Haruna. (2006). Projection optical system (U.S. Patent No. 7057820). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7057820
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