Expired European patentEurope
Polyimide films from pyromellitic dianhydride and 2,2'-bis(perfluoroalkoxy)benzidines as alignment layers for liquid crystal displays
EP 0758000 B1 · Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
Overview
The published document from the EPO: abstract, claims, description and drawings. Open it full size
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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 20, 1996 and granted December 19, 2001. A European patent lasts at most 20 years from filing, so its term ended June 20, 2016.
- 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 20, 2021.
- 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 20, 1996
PublishedFebruary 12, 1997
GrantedDecember 19, 2001
Term endedJune 20, 2016
Application numberEP 96109910
Classification (CPC)C08G73/1039 +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.