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Expired European patentEurope

Air entraining agent for concretes and mortars

EP 0752977 B1 · Applicant: Krems Chemie 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 March 30, 1995 and granted October 28, 1998. A European patent lasts at most 20 years from filing, so its term ended March 30, 2015.
  • 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 30, 2020.
  • 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 30, 1995
PublishedJanuary 15, 1997
GrantedOctober 28, 1998
Term endedMarch 30, 2015
Application numberEP 95912949
Classification (CPC)C04B40/0039 +1 more

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedMarch 30, 1995PublishedJan 15, 1997Patent grantedOct 28, 1998Term endedMarch 30, 2015

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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