EP 0793019 A3 19990602 - Improvements in vacuum pumps
Title (en)
Improvements in vacuum pumps
Title (de)
Vakuumpumpen
Title (fr)
Pompes à vide
Publication
Application
Priority
GB 9604645 A 19960301
Abstract (en)
[origin: EP0793019A2] 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
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)
Citation (search report)
- [X] WO 9301411 A1 19930121 - CHEN CHONGYUAN [JP]
- [Y] US 4954047 A 19900904 - OKUYAMA NOBUHISA [JP], et al
- [A] FR 2666853 A1 19920320 - TOYO ENGINEERING CORP [JP]
- [A] GB 2040361 A 19800828 - PIERBURG GMBH & CO KG
- [A] US 4699572 A 19871013 - BALKAU GUENTER K W [AU], et al
- [A] DE 2715102 A1 19781012 - SYNDICAT DES COPROPRIETAIRES D
- [A] US 4832578 A 19890523 - PUTT JAMES C [US]
- [Y] PATENT ABSTRACTS OF JAPAN vol. 013, no. 194 (M - 823) 10 May 1989 (1989-05-10)
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