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Expired European patentEurope

Composite membrane and process for producing same

EP 0442557 B1 · Applicant: METALLGESELLSCHAFT Aktiengesellschaft

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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 January 30, 1991 and granted November 2, 1994. A European patent lasts at most 20 years from filing, so its term ended January 30, 2011.
  • 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 July 30, 2016.
  • 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.
FiledJanuary 30, 1991
PublishedAugust 21, 1991
GrantedNovember 2, 1994
Term endedJanuary 30, 2011
Application numberEP 91200181
Classification (CPC)B01D69/1216 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedJan 30, 1991PublishedAug 21, 1991Patent grantedNov 2, 1994Term endedJan 30, 2011

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

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