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. 07, 2013
Filed:
Jul. 20, 2010
Applicants:
Takuji Yamamoto, Saitama, JP;
Nobuo Hiruma, Saitama, JP;
Motoo Takada, Saitama, JP;
Kozo Ono, Saitama, JP;
Masahiro Yoshimatsu, Saitama, JP;
Takehiro Takahashi, Saitama, JP;
Inventors:
Takuji Yamamoto, Saitama, JP;
Nobuo Hiruma, Saitama, JP;
Motoo Takada, Saitama, JP;
Kozo Ono, Saitama, JP;
Masahiro Yoshimatsu, Saitama, JP;
Takehiro Takahashi, Saitama, JP;
Assignee:
Nihon Dempa Kogyo Co., Ltd., Shibuya-Ku, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/22 (2006.01); G02B 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An optical filter is provided having an optical plate which has a chamfered section formed on an outer peripheral edge section of one principle surface of the optical plate and has isotropy with respect to wet-etching. The chamfered section is of an arc shape which is cross-sectionally concave in an inward direction of the optical plate.