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Expired European patentEurope

Asymmetric polyimide reverse osmosis membrane, method for preparation of same and use thereof for organic liquid separations

EP 0125908 B1 · Applicant: EXXON RESEARCH AND ENGINEERING COMPANY

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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.

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Why it's free to use

  • Filed May 11, 1984 and granted May 30, 1990. A European patent lasts at most 20 years from filing, so its term ended May 11, 2004.
  • 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 November 11, 2009.
  • 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.
FiledMay 11, 1984
PublishedNovember 21, 1984
GrantedMay 30, 1990
Term endedMay 11, 2004
Application numberEP 84303216
Classification (CPC)B01D67/0011 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMay 11, 1984PublishedNov 21, 1984Patent grantedMay 30, 1990Term endedMay 11, 2004

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.