GPI coverage and content

You can use Global Patent Index (GPI) to carry out detailed searches in the EPO's worldwide bibliographic (DOCDB), legal event (INPADOC) and full-text data sets, and download or visualise the search results for statistical analysis.

Current content: 156 632 791 patent documents

This week's update (21/06/2024 12:00 CET):

121 162 new documents added

981 197 documents amended

GPI key values

Run regular monitoring (e.g. monthly or quarterly) of technical areas or companies

Use built-in charts to visualise technical trends and patenting activity of companies

Choose the data you want to see and download to focus on what you are interested in

Run data quality assessments to measure the risk of incomplete search results

EP 0052251 B1 19840118 - REGENERATIVE COMPRESSOR

Title (en)

REGENERATIVE COMPRESSOR

Publication

EP 0052251 B1 19840118 (DE)

Application

EP 81108652 A 19811021

Priority

DE 3042840 A 19801113

Abstract (en)

[origin: EP0052251A1] 1. A side channel centrifugal compressor, in which the rotor hub (2) is provided with at least two rings of blades (3, 4) to which are assigned active annular channels (51, 52) in the housing (5), and in which a shared central body (6) is arranged between the blade rings, characterised in that the central body (6) is additionally provided with at least two active annular channels (61, 62) which are assigned to the blade sides (31, 41) of the double-suction blade rings (3, 4) which face towards the central body.

IPC 1-7

F04D 23/00

IPC 8 full level

F04D 23/00 (2006.01)

CPC (source: EP)

F04D 23/008 (2013.01)

Designated contracting state (EPC)

CH FR GB IT LI

DOCDB simple family (publication)

EP 0052251 A1 19820526; EP 0052251 B1 19840118; DE 3042840 A1 19820519; DE 3042840 C2 19840607

DOCDB simple family (application)

EP 81108652 A 19811021; DE 3042840 A 19801113