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: 157 337 350 patent documents

This week's update (19/07/2024 12:00 CET):

219 431 new documents added

1 247 852 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 0301993 A3 19891227 - A SURGE CONTROL FOR A COMPRESSOR

Title (en)

A SURGE CONTROL FOR A COMPRESSOR

Publication

EP 0301993 A3 19891227 (EN)

Application

EP 88630134 A 19880714

Priority

US 8051787 A 19870731

Abstract (en)

[origin: EP0301993A2] A surge control (24) is biased by a reset means (105) to provide a control point close to a compressor surge point that varies as a function of pneumatic load, temperature and pressure input to the compressor.

IPC 1-7

F04D 27/02; B64D 41/00

IPC 8 full level

F02C 7/32 (2006.01); F04D 27/02 (2006.01)

CPC (source: EP)

F04D 27/0215 (2013.01)

Citation (search report)

[X] EP 0059061 A2 19820901 - GARRETT CORP [US]
[X] GB 2024944 A 19800116 - LUCAS INDUSTRIES LTD
[A] GB 1155462 A 19690618 - CARRIER CORP [US]

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0301993 A2 19890201; EP 0301993 A3 19891227; CN 1030968 A 19890208; JP S6453094 A 19890301

DOCDB simple family (application)

EP 88630134 A 19880714; CN 88104746 A 19880730; JP 18667588 A 19880726