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:
Aug. 19, 2003
Filed:
Aug. 26, 1999
Applicant:
Inventors:
Assignee:
Seiko Seki Kabushiki Kaisha, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B 4/900 ;
U.S. Cl.
CPC ...
F04B 4/900 ;
Abstract
A vacuum pump capable of controlling a gas sucking performance is provided. A conductance variable mechanism ( ) is arranged at an inlet port ( ) formed inside a flange ( ). The conductance variable mechanism ( ) allows the area of a cross-section of the inlet port to be increased or decreased relative to the direction where gas is fed, so that an amount of gas to be sucked from the inlet port ( ) can be controlled.