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:
Jun. 07, 2005
Filed:
Jun. 03, 2002
Applicants:
Yoshinori Ojima, Kamakura, JP;
Kozo Matake, Kawasaki, JP;
Takanori Inada, Fujisawa, JP;
Kiyoshi Yanagisawa, Machida, JP;
Inventors:
Yoshinori Ojima, Kamakura, JP;
Kozo Matake, Kawasaki, JP;
Takanori Inada, Fujisawa, JP;
Kiyoshi Yanagisawa, Machida, JP;
Assignee:
Ebara Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02K001/00 ; F04B017/03 ;
U.S. Cl.
CPC ...
Abstract
A vacuum pump has a casing having an inlet port and an outlet port, and a pair of confronting pump rotors which are provided inside the casing and synchronously rotatable for drawing in a gas from the inlet port and discharging the gas from the outlet port. A motor for rotating the confronting pump rotors is a permanent magnet motor having a stator and a motor rotor. The motor rotor has an iron core and permanent magnets disposed within the iron core.