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. 08, 2009
Filed:
Aug. 31, 2006
Applicant:
Marsbed Hablanian, Wellesley, MA (US);
Inventor:
Marsbed Hablanian, Wellesley, MA (US);
Assignee:
Varian, S.p.A., Leini, Turin, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01D 1/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
A vacuum pump includes a housing having an inlet port and an exhaust port, at least one molecular drag stage within the housing, the molecular drag stage including a rotor and a stator that defines a tangential flow channel which opens onto a surface of the rotor, and a motor that rotates the rotor so that gas is pumped from the inlet port to the exhaust port. The stator defines one or more obstructions in the channel. The obstructions alter gas flow through the channel and produce turbulence under viscous or partially viscous flow conditions.