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Expired European patentEurope

Process for ion nitriding aluminum material

EP 0346931 B1 · Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO

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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 June 16, 1989 and granted October 20, 1993. A European patent lasts at most 20 years from filing, so its term ended June 16, 2009.
  • 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 December 16, 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.
FiledJune 16, 1989
PublishedDecember 20, 1989
GrantedOctober 20, 1993
Term endedJune 16, 2009
Application numberEP 89111003
Classification (CPC)C23C8/36

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedJune 16, 1989PublishedDec 20, 1989Patent grantedOct 20, 1993Term endedJune 16, 2009

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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