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Expired European patentEurope

Asymmetric cellulose triacetate-based ultrafiltration membranes and method of fabrication thereof

EP 0004943 B1 · Applicant: Sartorius GmbH.

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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.

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Why it's free to use

  • Filed April 11, 1979 and granted October 7, 1981. A European patent lasts at most 20 years from filing, so its term ended April 11, 1999.
  • 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 October 11, 2004.
  • 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.
FiledApril 11, 1979
PublishedOctober 31, 1979
GrantedOctober 7, 1981
Term endedApril 11, 1999
Application numberEP 79101118
Classification (CPC)B01D69/148 +1 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedApril 11, 1979PublishedOct 31, 1979Patent grantedOct 7, 1981Term endedApril 11, 1999

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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