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. 02, 2025
Filed:
Sep. 14, 2022
Applicant:
Fujikoki Corporation, Tokyo, JP;
Inventors:
Assignee:
FUJIKOKI CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K 31/04 (2006.01); F16K 27/02 (2006.01); F16K 31/50 (2006.01);
U.S. Cl.
CPC ...
F16K 31/504 (2013.01); F16K 27/029 (2013.01); F16K 31/04 (2013.01);
Abstract
An electric valve control device inputs a pulse to a stepping motor to rotate a rotor in a first direction. The electric valve control device obtains a voltage generated in a stator by rotation of the rotor. The electric valve control device determines whether an electric valve is in a first-rotation restricted state where the rotation of the rotor in the first direction is restricted, based on a degree of difference between a waveform of the voltage and a reference waveform of the voltage.