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:
Oct. 08, 1991
Filed:
May. 31, 1990
Applicant:
Inventor:
Tamotsu Mori, Tokyo, JP;
Assignee:
Man Design Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417417 ;
Abstract
An electromagnetic type reciprocating pump comprises an electromagnet whose magnetization and demagnetization are repeated by a half wave-rectified version of alternating current or direct current in the form of pulses, a piston having a magnetic member which is attracted by the magnetization of the electromagnet, a cylinder in which the piston is inserted and guided, a first urging member for imparting a reaction force in a backward direction to the piston which is moved in a forward direction and a second urging member for imparting a reaction force, which is weaker than that of the first urging member, to the piston in the forward direction.