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:
Nov. 11, 2003
Filed:
Mar. 15, 2002
Applicant:
Inventors:
Assignee:
Alcatel, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B 1/700 ; F04B 3/504 ;
U.S. Cl.
CPC ...
F04B 1/700 ; F04B 3/504 ;
Abstract
The invention concerns a pumping unit wherein the vacuum pump ( ) is driven by a motor ( ) comprised in a common monobloc housing forming motor housing ( ) and oil pan ( ) containing a gear assembly ( ) for coupling two parallel pump rotors ( ). To complement the sealing conditions provided by a dynamic seal ( ), the motor stator ( ) consists of an electric coil embedded in an oil-tight and gas-tight resin, thereby not requiring other more expensive and bulky sealing means, reducing production cost and enhancing the pumping unit dependability.