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Expired European patentEurope

Cement admixture, production thereof, and cement composition

EP 0448717 B1 · Applicant: NIPPON SHOKUBAI CO., LTD.

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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 July 23, 1990 and granted November 29, 1995. A European patent lasts at most 20 years from filing, so its term ended July 23, 2010.
  • 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 January 23, 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.
FiledJuly 23, 1990
PublishedOctober 2, 1991
GrantedNovember 29, 1995
Term endedJuly 23, 2010
Application numberEP 90910905
Classification (CPC)C04B24/16 +2 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedJuly 23, 1990PublishedOct 2, 1991Patent grantedNov 29, 1995Term endedJuly 23, 2010

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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