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. 02, 1992
Filed:
Dec. 27, 1990
Applicant:
Inventor:
Claude Saulgeot, Veyrier du Lac, FR;
Assignee:
Alcatel CIT, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04D / ; F04B / ;
U.S. Cl.
CPC ...
415 90 ; 4174234 ; 417203 ; 417205 ;
Abstract
A pump enabling a molecular vacuum to be reached, the pump comprising a stator and rotor assembly comprising two rotors having parallel shafts rotating in opposite directions, the stator including a suction inlet and a delivery outlet, wherein the pump is split axially into a first zone situated at its suction end, followed by a second zone, said first zone being of the turbomolecular type having fins and two rotors, said second zone being of the type having two screws or two rotary pistons on parallel shafts, one of the shafts being driven by a motor and the other being driven by a transmission.