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:
Jan. 15, 2002
Filed:
Aug. 24, 2000
Tadao Watanabe, Ibaraki-ken, JP;
Atsushi Fujiwara, Ibaraki-ken, JP;
SMC Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed is a pressure control apparatus comprising an air-supplying solenoid-operated valve and an air-discharging solenoid-operated valve which are composed of normally closed type solenoid-operated valves respectively, a power source-monitoring circuit for detecting whether or not a power supply source is dropped to be lower than a predetermined value, a power source-compensating circuit for delaying drop of a solenoid-operated valve-driving power source for driving the air-discharging solenoid-operated valve when the power supply source is dropped, and a control circuit for deriving an OFF signal to the air-supplying solenoid-operated valve and deriving an ON signal to the air-discharging solenoid-operated valve when the power supply source is dropped.