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: 157 117 910 patent documents

This week's update (12/07/2024 12:00 CET):

139 301 new documents added

1 340 825 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 0240278 B1 19911016 - IMPROVEMENTS RELATING TO GAS COMPRESSORS

Title (en)

IMPROVEMENTS RELATING TO GAS COMPRESSORS

Publication

EP 0240278 B1 19911016 (EN)

Application

EP 87302717 A 19870330

Priority

GB 8607955 A 19860401

Abstract (en)

[origin: EP0240278A2] A piston and cylinder air compressor has unloader valve signalled to overcome a spring bias by air pressure at a port 27, indicative that a desired charge pressure has been attained in a reservoir, to open a path between the compression chamber 6 and the inlet chamber 12, the unloader valve having a pressure responsive area subject to compression chamber pressure and acting in a sense to enhance the spring bias.

IPC 1-7

F04B 49/00

IPC 8 full level

F04B 49/24 (2006.01)

CPC (source: EP)

F04B 49/24 (2013.01)

Designated contracting state (EPC)

BE DE ES FR IT NL SE

DOCDB simple family (publication)

EP 0240278 A2 19871007; EP 0240278 A3 19890830; EP 0240278 B1 19911016; DE 3773723 D1 19911121; ES 2026529 T3 19920501; GB 2188682 A 19871007; GB 2188682 B 19891115; GB 8607955 D0 19860508

DOCDB simple family (application)

EP 87302717 A 19870330; DE 3773723 T 19870330; ES 87302717 T 19870330; GB 8607955 A 19860401