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Expired European patentEurope

Chemical polishing bath and method for aluminum alloys

EP 0325097 B1 · Applicant: International Business Machines 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 December 12, 1988 and granted April 15, 1992. A European patent lasts at most 20 years from filing, so its term ended December 12, 2008.
  • 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 June 12, 2014.
  • 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.
FiledDecember 12, 1988
PublishedJuly 26, 1989
GrantedApril 15, 1992
Term endedDecember 12, 2008
Application numberEP 88850420
Classification (CPC)C23F3/03

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedDec 12, 1988PublishedJuly 26, 1989Patent grantedApril 15, 1992Term endedDec 12, 2008

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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