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. 21, 1992
Filed:
Apr. 25, 1990
Applicant:
Inventors:
Akira Kawamura, Shizuoka, JP;
Teshio Osada, Tokyo, JP;
Assignee:
Nitto Kohki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417 45 ; 417417 ;
Abstract
An electromagnetic reciprocating pump comprises a pressure sensor for detecting the actual outlet pressure of the electromagnetic reciprocating pump, and the strokes of the electromagnetic drive means and the compressor piston connected to the electromagnetic drive means varies are feedback controlled by the deviation from the present outlet pressure of the actual outlet pressure detected by the pressure sensor. The stroke of the electromagnetic drive means is controlled by adjusting the average magnitude of the half-wave AC current supplied to the electromagnetic drive means.