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Expired European patentEurope

Dry granular composition for, and method of, polishing ferrous compositions

EP 0334877 B1 · Applicant: CHEMIMETALS PROCESSING, INC.

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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 November 20, 1987 and granted March 3, 1993. A European patent lasts at most 20 years from filing, so its term ended November 20, 2007.
  • 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 20, 2013.
  • 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.
FiledNovember 20, 1987
PublishedOctober 4, 1989
GrantedMarch 3, 1993
Term endedNovember 20, 2007
Application numberEP 87908091
Classification (CPC)C23F3/00 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedNov 20, 1987PublishedOct 4, 1989Patent grantedMarch 3, 1993Term endedNov 20, 2007

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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