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Expired European patentEurope

Use of polyfluorised surface-active compounds as water-reducing plasticizing agents for mortars and concrete

EP 0285506 B1 · Applicant: ELF ATOCHEM S.A.

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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 March 24, 1988 and granted January 16, 1991. A European patent lasts at most 20 years from filing, so its term ended March 24, 2008.
  • 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 September 24, 2013.
  • 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.
FiledMarch 24, 1988
PublishedOctober 5, 1988
GrantedJanuary 16, 1991
Term endedMarch 24, 2008
Application numberEP 88400723
Classification (CPC)C04B24/005

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedMarch 24, 1988PublishedOct 5, 1988Patent grantedJan 16, 1991Term endedMarch 24, 2008

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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