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Expired European patentEurope

Tubular cast piece inner surface working apparatus

EP 0028653 B1 · Applicant: KUBOTA LIMITED

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 19, 1979 and granted July 4, 1984. A European patent lasts at most 20 years from filing, so its term ended December 19, 1999.
  • 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 19, 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.
FiledDecember 19, 1979
PublishedMay 20, 1981
GrantedJuly 4, 1984
Term endedDecember 19, 1999
Application numberEP 80900071
Classification (CPC)B22D31/002 +2 more

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedDec 19, 1979PublishedMay 20, 1981Patent grantedJuly 4, 1984Term endedDec 19, 1999

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.