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Expired European patentEurope

Erasable ball-point pen ink composition

EP 0042438 B1 · Applicant: PENTEL KABUSHIKI KAISHA

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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.

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Why it's free to use

  • Filed December 22, 1980 and granted January 4, 1984. A European patent lasts at most 20 years from filing, so its term ended December 22, 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 June 22, 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.
FiledDecember 22, 1980
PublishedDecember 30, 1981
GrantedJanuary 4, 1984
Term endedDecember 22, 2000
Application numberEP 81900078
Classification (CPC)C09D11/18

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedDec 22, 1980PublishedDec 30, 1981Patent grantedJan 4, 1984Term endedDec 22, 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.