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Expired European patentEurope

Method of producing clad steel materials

EP 0022605 B1 · Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA

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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 April 30, 1980 and granted April 13, 1983. A European patent lasts at most 20 years from filing, so its term ended April 30, 2000.
  • 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 October 30, 2005.
  • 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.
FiledApril 30, 1980
PublishedJanuary 21, 1981
GrantedApril 13, 1983
Term endedApril 30, 2000
Application numberEP 80301409
Classification (CPC)B23K15/00 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedApril 30, 1980PublishedJan 21, 1981Patent grantedApril 13, 1983Term endedApril 30, 2000

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.