Global Patent Index - EP 1256725 A1

EP 1256725 A1 2002-11-13 - Vacuum pump

Title (en)

Vacuum pump

Title (de)

Vakuumpumpe

Title (fr)

Pompe à vide

Publication

EP 1256725 A1 (EN)

Application

EP 02252919 A

Priority

JP 2001133360 A

Abstract (en)

[origin: US2002159899A1] The present invention provides a vacuum pump having a small possibility of causing a damage of a rotor, excellent in working efficiency of the balancing of the rotor, and capable of keeping the balance during a long period of time. A ring shape groove is formed at a lower portion side internal surface of a rotor along the circumferential direction of the rotor. A weight for catching the balance of the rotor is fitted in and attached to the ring shape groove. Accordingly, there is no change of the section and no notch in the circumferential direction of the outer circumference of the rotor so that the stress concentration or the like is not caused and the maximum stress of the rotor is reduced, whereby the damage of the rotor is not easily caused.

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

F04D 19/04; F04D 29/66

IPC 8 full level (invention and additional information)

F04D 19/04 (2006.01); F04D 29/66 (2006.01)

CPC (invention and additional information)

F04D 19/04 (2013.01); F04D 29/662 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 1256725 A1 20021113; JP 2002327697 A 20021115; KR 20020084411 A 20021107; US 2002159899 A1 20021031

INPADOC legal status


2004-05-06 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20031028

2003-07-30 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20030617

2003-07-30 [AKX] PAYMENT OF DESIGNATION FEES

- Designated State(s): DE FR GB

2003-07-09 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20030513

2002-11-13 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

2002-11-13 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI