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Expired European patentEurope

Readily biodegradable anti-foaming agent for aqueous systems

EP 0542980 B1 · Applicant: DR. TH. BÖHME KG CHEM. FABRIK GMBH & CO.

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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 June 10, 1992 and granted March 20, 1996. A European patent lasts at most 20 years from filing, so its term ended June 10, 2012.
  • 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 December 10, 2017.
  • 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.
FiledJune 10, 1992
PublishedMay 26, 1993
GrantedMarch 20, 1996
Term endedJune 10, 2012
Application numberEP 92912731
Classification (CPC)D21H21/12 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedJune 10, 1992PublishedMay 26, 1993Patent grantedMarch 20, 1996Term endedJune 10, 2012

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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