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:
Oct. 15, 2002
Filed:
May. 24, 2000
Alan John Saunders, Angmering, GB;
The BOC Group PLC, Windlesham, GB;
Abstract
A vacuum pump of the scroll-type has a housing, a first fixed scroll member having an end plate and an involute spiral wrap attached thereto and a second orbital scroll member having an end plate and an involute spiral wrap attached thereto. The scroll members are arranged in the housing such that their respective wraps intermesh so that on orbital movement of the second scroll member relative to the first scroll member a volume of gas will be trapped and urged from one end of the wraps to the other end. A shaft for driving the second scroll member and wherein a member is provided which is adapted to separate the vacuum space in the housing from the shaft and also to prevent the second scroll member from rotating the said member being made from a polymer material.