Expired European patentEurope
Process for the preparation of copolyamides based on hexamethylene diamine of adipic acid, optionally at least another dicarboxylic acid with a short chain and a dimeric acid
EP 0252860 B1 · Applicant: RHONE-POULENC CHIMIE
Overview
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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 23, 1987 and granted October 23, 1991. A European patent lasts at most 20 years from filing, so its term ended June 23, 2007.
- 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 23, 2012.
- 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 23, 1987
PublishedJanuary 13, 1988
GrantedOctober 23, 1991
Term endedJune 23, 2007
Application numberEP 87420173
Classification (CPC)C08G69/34 +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.