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: 158 678 210 patent documents

This week's update (20/09/2024 12:00 CET):

139 196 new documents added

884 989 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 0132487 B1 19881109 - PROCESS FOR CONTROLLING AT LEAST TWO TURBO COMPRESSORS MOUNTED IN PARALLEL

Title (en)

PROCESS FOR CONTROLLING AT LEAST TWO TURBO COMPRESSORS MOUNTED IN PARALLEL

Publication

EP 0132487 B1 19881109 (DE)

Application

EP 84100822 A 19840126

Priority

US 51909783 A 19830801

Abstract (en)

[origin: US4560319A] A method and apparatus for operating parallel connected turbocompressors jointly controls their operation such that each operates at the same percentage of its capacity, i.e. such that the spacing of the operating point of each from its blowoff line which is parallel to its pumping limit is the same.

IPC 1-7

F04D 27/00

IPC 8 full level

F04D 27/00 (2006.01); F04D 27/02 (2006.01)

CPC (source: EP US)

F04D 27/0253 (2013.01 - EP US); F04D 27/0269 (2013.01 - EP US)

Designated contracting state (EPC)

CH DE FR GB IT LI NL

DOCDB simple family (publication)

EP 0132487 A2 19850213; EP 0132487 A3 19860409; EP 0132487 B1 19881109; DE 3475094 D1 19881215; JP S6045795 A 19850312; US 4560319 A 19851224

DOCDB simple family (application)

EP 84100822 A 19840126; DE 3475094 T 19840126; JP 14768884 A 19840718; US 51909783 A 19830801