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Expired European patentEurope

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EP 0109154 B1 · Applicant: CIPHER DATA PRODUCTS, INCORPORATED

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Overview

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

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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 September 20, 1983 and granted January 4, 1989. A European patent lasts at most 20 years from filing, so its term ended September 20, 2003.
  • 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 March 20, 2009.
  • 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.
FiledSeptember 20, 1983
PublishedMay 23, 1984
GrantedJanuary 4, 1989
Term endedSeptember 20, 2003
Application numberEP 83305529
Classification (CPC)G11B15/1883 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedSep 20, 1983PublishedMay 23, 1984Patent grantedJan 4, 1989Term endedSep 20, 2003

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.