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Expired European patentEurope

Additive composition for coal-water slurry and coal-water slurry composition

EP 0484152 B1 · Applicant: NIPPON SHOKUBAI CO., LTD.

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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 October 31, 1991 and granted December 15, 1993. A European patent lasts at most 20 years from filing, so its term ended October 31, 2011.
  • 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 May 1, 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.
FiledOctober 31, 1991
PublishedMay 6, 1992
GrantedDecember 15, 1993
Term endedOctober 31, 2011
Application numberEP 91310054
Classification (CPC)C10L1/326 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedOct 31, 1991PublishedMay 6, 1992Patent grantedDec 15, 1993Term endedOct 31, 2011

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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