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. 07, 1981
Filed:
Jun. 08, 1979
Applicant:
Inventor:
Manfred Haas, Herten, DE;
Assignee:
Friedrich Wilh. Schwing GmbH, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ; F04B / ;
U.S. Cl.
CPC ...
417346 ;
Abstract
A multicylinder piston pump for pumping viscous liquids of varying composition with each cylinder having an extendible tubular piston intake valve and discharge valve is disclosed. The extendible tubular piston valves have a tubular piston slidably mounted in a cylindrical passage of a housing mounted adjacent to each cylinder. The tubular piston has an inner bore into which an inner piston is slidably mounted therein. The inner piston is connected to a piston rod which is connected to the housing. Hydraulic oil is used to extend each tubular piston valve so as to control the intake and discharge of fluid into the piston pump.