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Expired European patentEurope

SiA1ON COMPOSITES AND METHOD OF PREPARING THE SAME

EP 0629181 B1 · Applicant: THE DOW CHEMICAL 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 February 26, 1993 and granted April 9, 1997. A European patent lasts at most 20 years from filing, so its term ended February 26, 2013.
  • 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 August 26, 2018.
  • 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.
FiledFebruary 26, 1993
PublishedDecember 21, 1994
GrantedApril 9, 1997
Term endedFebruary 26, 2013
Application numberEP 93907106
Classification (CPC)C04B35/597

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedFeb 26, 1993PublishedDec 21, 1994Patent grantedApril 9, 1997Term endedFeb 26, 2013

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.