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. 04, 2017
Filed:
Jan. 09, 2014
Nippon Electric Glass Co., Ltd., Otsu-shi, Shiga, JP;
Hirokazu Takeuchi, Otsu, JP;
Shuhei Ogawa, Otsu, JP;
Nobuo Funabiki, Otsu, JP;
Masahiro Kobayashi, Otsu, JP;
NIPPON ELECTRIC GLASS CO., LTD., Shiga, JP;
Abstract
What is achieved is an optical wavelength multiplexer/demultiplexer not necessarily requiring the function of adjusting the optical path. A value (ΔL−ΔL)/L obtained by dividing a difference between a maximum value ΔLand a minimum value ΔLof ΔL in a range of −40° C. to 80° C. by L is 8×10or less where L represents a length of a crystallized glass () at 30° C. and ΔL represents a difference between a length (L) of the crystallized glass () at each of the temperatures and the length (L) thereof at 30° C.