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:
Aug. 23, 1994
Filed:
Dec. 30, 1992
Applicant:
Inventors:
Toshio Mikiya, Tokyo, JP;
Toshio Osada, Tokyo, JP;
Assignee:
Nitto Kohki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417417 ;
Abstract
The inside-outside positional relationship between a field core of an electromagnet and an armature provided on a piston in an electromagnetic pump is reversed as compared with the prior art pump, that is, an annular armature is placed outside and a field core is placed inside the armature. The annular armature attached to the piston reciprocates in the axial direction thereof and the inside surface of the armature is opposed to the outside circumference of the field core of an electromagnet having formed thereon a plurality of outwardly and radially projecting magnetic poles, and being fixed to a part of a casing.