Expired European patentEurope
Method and device to establish bidirectional and/or multidirectional communications between different persons grouped in different geographically distant locations connected to each other by telephone lines
EP 0041902 B1 · Applicant: Faye, André
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
Read the whole patent
Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 10, 1981 and granted April 2, 1986. A European patent lasts at most 20 years from filing, so its term ended June 10, 2001.
- A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by December 10, 2006.
- We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledJune 10, 1981
PublishedDecember 16, 1981
GrantedApril 2, 1986
Term endedJune 10, 2001
Application numberEP 81400921
Classification (CPC)H04M3/56 +1 more
Timeline
Timeline From EPO dates
Sources & verification
Official EPO records
Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.