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: 159 679 824 patent documents

This week's update (08/11/2024 12:00 CET):

164 112 new documents added

576 445 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 0254524 B1 19921216 - GAS COMPRESSOR APPARATUS

Title (en)

GAS COMPRESSOR APPARATUS

Publication

EP 0254524 B1 19921216 (EN)

Application

EP 87306423 A 19870720

Priority

GB 8618155 A 19860725

Abstract (en)

[origin: EP0254524A2] An air compressor is provided with an additional valve (7) in the cylinder head which is operable by a piston (16) in response to a governer signal to connect an extra closed clearance volume (27) to the compression chamber (9) for unloading the compressor.

IPC 1-7

F04B 49/02

IPC 8 full level

F04B 49/16 (2006.01)

CPC (source: EP)

F04B 49/16 (2013.01)

Designated contracting state (EPC)

BE DE FR IT NL SE

DOCDB simple family (publication)

EP 0254524 A2 19880127; EP 0254524 A3 19880817; EP 0254524 B1 19921216; DE 3783092 D1 19930128; DE 3783092 T2 19930701; GB 8618155 D0 19860903

DOCDB simple family (application)

EP 87306423 A 19870720; DE 3783092 T 19870720; GB 8618155 A 19860725