Vacuum pumps

Details Vacuum pumps Vacuum pumps

1989-04-21

1991-02-26

Rosenthal, Arnold

Pumps

Including means to prevent foreign material settling from...

By application of separate fluid

417432, 4174232, 4174239, F04B 2500, F04B 3900

Patent

active

049957945

ABSTRACT:
A vacuum pump comprising a pumping chamber having an inlet and an outlet through which gas from an enclosure connectible to the inlet can be pumped, in which means are provided to allow the selective introduction through the chamber of a flow of recirculating purge gas to effect pumping of the chamber, the means preferably being such that the recirculating purge gas is produced in a gas circuit including the inlet and the outlet and also including a filter.

REFERENCES:
patent: 2148671 (1939-02-01), Allen
patent: 3536418 (1970-10-01), Breaux
patent: 4534699 (1985-08-01), Possell
patent: 4621985 (1986-11-01), Kobayashi et al.
patent: 4734018 (1988-03-01), Taniyama et al.

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