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:
Mar. 25, 2003
Filed:
Nov. 07, 2001
Applicant:
Inventors:
Nigel Paul Schofield, Horsham, GB;
Michael Henry North, Reigate, GB;
Assignee:
The BOC Group, plc, Windlesham, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04C 1/816 ; F04C 2/904 ;
U.S. Cl.
CPC ...
F04C 1/816 ; F04C 2/904 ;
Abstract
A screw pump has two parallel shafts mounted in a pump body, each shaft thereon and each rotor has at least one helical vane or thread. When the helical vanes or threads inter mesh causing a fluid to be pumped from an inlet towards an outlet of the pump. The bearings associated with each shaft are being positioned in cavities within the first and second rotors which are sealed at their ends closest to the pump inlet. A thermal shield is provided between the bearing arrangements and the internal cavity surfaces.