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Expired European patentEurope

Process for the defoaming of aqueous dispersions of polymeric organic bodies by addition of polyoxialkylene-polysiloxane-solventless bulk polymerizates

EP 0331952 B1 · Applicant: Th. Goldschmidt AG

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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 18, 1989 and granted April 28, 1993. A European patent lasts at most 20 years from filing, so its term ended February 18, 2009.
  • 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 18, 2014.
  • 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 18, 1989
PublishedSeptember 13, 1989
GrantedApril 28, 1993
Term endedFebruary 18, 2009
Application numberEP 89102847
Classification (CPC)C08G77/46 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedFeb 18, 1989PublishedSep 13, 1989Patent grantedApril 28, 1993Term endedFeb 18, 2009

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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