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EP 0793019 A2 19970903 - Improvements in vacuum pumps

Title (en)

Improvements in vacuum pumps

Title (de)

Vakuumpumpen

Title (fr)

Pompes à vide

Publication

EP 0793019 A2 19970903 (EN)

Application

EP 97301303 A 19970227

Priority

GB 9604645 A 19960301

Abstract (en)

A vacuum pump which comprises a multi-stage reciprocating piston mode of operation in which piston reciprocation is effected by electromagnetic drive means and a counter-acting spring means and in which the pump stages are connected in series between a pump inlet and a pump outlet such that, in use, gas being transferred through the pump passes through the stages in turn. <IMAGE>

IPC 1-7

F04B 25/02; F04B 35/04

IPC 8 full level

F04B 25/02 (2006.01); F04B 35/04 (2006.01); F04B 37/14 (2006.01)

CPC (source: EP)

F04B 25/02 (2013.01); F04B 35/045 (2013.01); F04B 37/14 (2013.01)

Designated contracting state (EPC)

CH DE FR GB LI

DOCDB simple family (publication)

EP 0793019 A2 19970903; EP 0793019 A3 19990602; GB 9604645 D0 19960501; JP H102281 A 19980106

DOCDB simple family (application)

EP 97301303 A 19970227; GB 9604645 A 19960301; JP 4759497 A 19970303