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Expired European patentEurope

Polyorganosiloxane collectors in the beneficiation of fine coal by froth flotation

EP 0164237 B1 · Applicant: DOW CORNING CORPORATION

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Overview

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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 21, 1985 and granted March 6, 1991. A European patent lasts at most 20 years from filing, so its term ended May 21, 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 21, 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 21, 1985
PublishedDecember 11, 1985
GrantedMarch 6, 1991
Term endedMay 21, 2005
Application numberEP 85303582
Classification (CPC)B03D1/02 +2 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedMay 21, 1985PublishedDec 11, 1985Patent grantedMarch 6, 1991Term endedMay 21, 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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