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:
Dec. 23, 1997
Filed:
Mar. 01, 1996
Applicant:
Inventor:
Graeme Huntley, Crawley, GB;
Assignee:
The BOC Group plc, Windlesham, GB;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04F / ;
U.S. Cl.
CPC ...
417153 ;
Abstract
A diffusion pump is provided with an outer body and a chimney positioned within the outer body. A top cap is positioned about the top of the chimney to form an annular passageway (or an annular array of passageways) therebetween. A guard ring is positioned generally above the top cap. Coolers cool the outer body and the guard ring and working fluid present in the base of the outer body is heated to cause evaporated oil to pass up the chimney. A baffle, substantially thermally isolated from the guard ring, is contained within the outer body.