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:
Jun. 18, 2002
Filed:
Sep. 15, 2000
Gianpietro Ferrari Aggradi, Florence, IT;
Vasco Mezzedimi, Poggibonsi, IT;
Corrado Palarchi, Florence, IT;
Nuovo Pignone Holding S.p.A., Florence, IT;
Abstract
A screw-type pumping unit ( ) for treatment of fluids in several phases comprises a case ( ) which contains a pumping chamber ( ), inside which there are accommodated at least two screws ( ), one of which ( ) is a drive screw, and supports at one of its ends a first gear ( ), which engages with a second gear ( ), which in turn is supported at one end of a driven screw ( ). The first and the second gear ( ) are contained in a casing ( ) which is fitted onto them, and is provided with at least two through holes ( ) produced in two substantially opposite portions, through one of which oil can be admitted into the casing ( ), and wherein the oil can be discharged through the other through hole ( ), such that the casing ( ), together with the gears ( ), forms a gear pump which can keep the lubrication oil of the pumping unit ( ) circulating.