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Expired European patentEurope

Compositions and methods for reducing the permeability of underground strata

EP 0175442 B1 · Applicant: THE BORDEN COMPANY LIMITED

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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 May 20, 1985 and granted October 19, 1988. A European patent lasts at most 20 years from filing, so its term ended May 20, 2005.
  • 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 November 20, 2010.
  • 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.
FiledMay 20, 1985
PublishedMarch 26, 1986
GrantedOctober 19, 1988
Term endedMay 20, 2005
Application numberEP 85303546
Classification (CPC)C09K8/90 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedMay 20, 1985PublishedMarch 26, 1986Patent grantedOct 19, 1988Term endedMay 20, 2005

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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