Patent · US Expired

Gas friction pump

US6540475B2 · kind B2 · utility

0Cited by

10References

8Claims

0Family size

Assignee

PFEIFFER VACUUM · FR

Inventors

Armin Conrad · Herborn, DE
Peter Fahrenbach · Solms, DE

Key dates

Filing date	May 14, 2001
Grant date	Apr 1, 2003
Priority date	—
Expiry date	May 14, 2021

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04D29/4213
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A gas friction pump including a plurality of pumping active rotor and stator components arranged in the pump housing for delivery of gases and for producing a compression ration and having a diameter larger than a diameter of the suction opening formed in the housing, and a modified rotor component located adjacent to the suction opening and having a radial extent which increases starting from the suction opening in a direction of a radial extent of the pumping active rotor and stator components.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.