Expired European patentEurope
Control circuit for half-duplex/simplex interface in communication system
EP 0505306 B1 · Applicant: International Business Machines Corporation
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 February 26, 1992 and granted September 24, 1997. A European patent lasts at most 20 years from filing, so its term ended February 26, 2012.
- 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 August 26, 2017.
- 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.
FiledFebruary 26, 1992
PublishedSeptember 23, 1992
GrantedSeptember 24, 1997
Term endedFebruary 26, 2012
Application numberEP 92480035
Classification (CPC)H04L5/16
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.