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: 157 593 259 patent documents

This week's update (02/08/2024 12:00 CET):

108 752 new documents added

1 451 440 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 0428355 A3 19910703 - METHOD AND APPARATUS FOR FORMING DUCTING

Title (en)

METHOD AND APPARATUS FOR FORMING DUCTING

Publication

EP 0428355 A3 19910703 (EN)

Application

EP 90312319 A 19901112

Priority

GB 8925669 A 19891114

Abstract (en)

[origin: EP0428355A2] The present invention provides a method for forming polygonal ducting from an intially circular cross-section duct by radially expanding a mandrel within the duct so as to cause radial deformation of the duct into the desired shape. The invention also provides a mandrel for use in the method of the invention.

IPC 1-7

B21D 15/02

IPC 8 full level

B21D 15/02 (2006.01)

CPC (source: EP)

B21D 15/02 (2013.01)

Citation (search report)

[Y] GB 1425778 A 19760218 - NIKIA AB OY
[Y] FR 732296 A 19320915
[A] FR 2125149 A1 19720929 - GALLAY FUTS METALLIQUES [FR]
[A] US 3981172 A 19760921 - HESS JOHANN T, et al
[A] US 4004444 A 19770125 - POLLART GARY M

Designated contracting state (EPC)

AT BE CH DE DK ES FR GB GR IT LI LU NL SE

DOCDB simple family (publication)

EP 0428355 A2 19910522; EP 0428355 A3 19910703; GB 8925669 D0 19900104

DOCDB simple family (application)

EP 90312319 A 19901112; GB 8925669 A 19891114