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European application, no grantEurope

Two-way communication sheets in the form of double post card, double letter sheet, and the like

EP 0404714 A2 · Applicant: KABUSHIKI KAISHA CHALLENGE FIVE

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Overview

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

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed February 26, 1990 and never granted as a European patent. Had it been granted, its 20-year term would have ended February 26, 2010.
  • 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 August 26, 2015.
  • 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.
FiledFebruary 26, 1990
PublishedDecember 27, 1990
GrantedNever granted
Term endedFebruary 26, 2010
Application numberEP 90810142
Classification (CPC)B42D15/085

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedFeb 26, 1990PublishedDec 27, 1990Term endedFeb 26, 2010

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.