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:
Sep. 30, 1986
Filed:
Mar. 19, 1982
Applicant:
Inventor:
Isao Sasao, Inazawa, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340 / ; 340 20 ; 187 / ;
Abstract
A call system for an elevator includes a call button and call registration lamp connected to two electrodes of a thyristor. The third electrode is connected to a conversion circuit. The conversion circuit is connected to a control device. The control device determines whether the call signal is to be effective at a given time. The conversion circuit receives the call signal and the indication of effectiveness and forwards the call signal to the control device only when the signal is to be effective. The conversion device includes a memory for storing the state of effectiveness, a call signal detecting circuit and a driving circuit.