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Expired European patentEurope

Magnetic brush development apparatus

EP 0031503 B1 · Applicant: Ricoh Company, 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 January 11, 1979 and granted August 7, 1985. A European patent lasts at most 20 years from filing, so its term ended January 11, 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 July 11, 2004.
  • 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.
FiledJanuary 11, 1979
PublishedJuly 8, 1981
GrantedAugust 7, 1985
Term endedJanuary 11, 1999
Application numberEP 80107642
Classification (CPC)G03G15/0921

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedJan 11, 1979PublishedJuly 8, 1981Patent grantedAug 7, 1985Term endedJan 11, 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.