Global patent index - EP 1023538 A1

EP 1023538 A1 2000-08-02 - SPIRAL VACUUM PUMP

Title (en)

SPIRAL VACUUM PUMP

Title (de)

SPIRALVAKUUMPUMPE

Title (fr)

POMPE A VIDE A SPIRALES

Publication

EP 1023538 A1 (FR)

Application

EP 97938731 A

Priority

CH 9700343 W

Abstract (en)

[origin: WO9914502A1] The invention concerns a pump with spirals comprising means (29, 19, 19A) for preserving a minimum clearance between the joints (5) arranged on the ridges of each spiralling wall (27, 28, 33, 34) and the flat wall (25, 26, 31, 32) facing it. Such an arrangement, which is made possible by the low pressure difference prevailing between the two adjacent transfer chambers (50, 51), prevents the wear of the joints, the soiling of the transfer chambers as well as overheating caused by friction between the joints.

IPC 1-7 (main, further and additional classification)

F04C 18/02

IPC 8 full level (invention and additional information)

F01C 21/10 (2006.01); F04C 18/02 (2006.01)

CPC (invention and additional information)

F01C 21/102 (2013.01); F04C 18/0223 (2013.01)

Citation (search report)

See references of WO 9914502A1

Designated contracting state (EPC)

AT BE CH DE DK ES FR GB IE IT LI NL SE

EPO simple patent family

WO 9914502 A1 19990325; AU 4109597 A 19990405; AU 731955 B2 20010405; CA 2304018 A1 19990325; EP 1023538 A1 20000802; JP 2001516848 A 20011002; US 6290477 B1 20010918

INPADOC legal status

2003-10-08 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20030325

2003-01-02 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20021114

2000-08-02 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000222

2000-08-02 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH DE DK ES FR GB IE IT LI NL SE