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:
Dec. 25, 2001
Filed:
Oct. 06, 2000
Yasuyuki Fukashiro, Yokohama, JP;
Shinichi Kuwano, Yokohama, JP;
Kenji Yamahara, Yokohama, JP;
Yukio Hayashi, Fujisawa, JP;
Hideaki Tsushima, Komae, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical signal switching apparatus that maintains an optical switch to a specified state even when noise is generated during the turning on and/or off of power to an optical switch control unit which controls the optical switch. The optical switch control unit includes an optical switch driving unit, a power supply and a power supply surveillance unit. When a specified condition of the power supply is not satisfied, a control signal is generated by the power supply surveillance unit. Upon detection of the control signal the optical switch driving unit, fixes the state of the optical switch to a previously set state without regard to the input to the optical switch driving unit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile