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. 01, 2014
Filed:
Dec. 01, 2009
Yuki Hanamura, Nagano, JP;
Takeo Funakawa, Nagano, JP;
Tsukasa Funasaka, Nagano, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An optical filter comprising a first substrate, a first mirror formed on the first substrate, a second substrate coupled to the first substrate, the second substrate including a concave portion, and a second mirror formed on the concave portion and facing the first mirror, wherein the first substrate includes a first portion located on the first mirror, a second portion located around the first portion, a third portion located around the second portion, and a fourth portion located around the third portion, wherein both a thickness of the second portion and a thickness of the fourth portion are equal to or smaller than a thickness of the first portion.