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Expired European patentEurope

Device for purifying tobacco smoke

EP 0040252 B1 · Applicant: JAPAN SPECIAL-HIGH TECHNIQUE RESEARCH INSTITUTE CO., 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 11, 1980 and granted July 17, 1985. A European patent lasts at most 20 years from filing, so its term ended November 11, 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 May 11, 2006.
  • 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 11, 1980
PublishedNovember 25, 1981
GrantedJuly 17, 1985
Term endedNovember 11, 2000
Application numberEP 80902181
Classification (CPC)A24F1/02 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedNov 11, 1980PublishedNov 25, 1981Patent grantedJuly 17, 1985Term endedNov 11, 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.