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Expired European patentEurope

Device for cleaning inner surfaces of heat exchanger tubes

EP 0317331 B1 · Applicant: HITACHI, LTD.

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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 November 18, 1988 and granted September 8, 1993. A European patent lasts at most 20 years from filing, so its term ended November 18, 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 May 18, 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.
FiledNovember 18, 1988
PublishedMay 24, 1989
GrantedSeptember 8, 1993
Term endedNovember 18, 2008
Application numberEP 88310898
Classification (CPC)F28G1/125

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedNov 18, 1988PublishedMay 24, 1989Patent grantedSep 8, 1993Term endedNov 18, 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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