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. 19, 1994
Filed:
Aug. 21, 1992
Applicant:
Inventors:
Paolo Fontanazzi, Modena, IT;
Alberto Fini, Carpi, IT;
Assignee:
Tetra Dev-Co, Modena, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417 53 ; 417517 ; 417532 ;
Abstract
A method of pumping a product by means of a dosing pump unit entails that two individually driven pump chambers, which are connected with a common outlet, are controlled in such a way that the suction phases of the pump chambers overlap each other so that the total inflow to the pump unit is maintained constant. A pump unit includes two pump chambers which have a common inlet and outlet. Communication between the pump chambers and the inlet and outlet is controlled by a valve body, having an inlet passage that is formed such that it can be oriented to connect both pump chambers with the inlet.