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Expired European patentEurope

A device for enciphering and deciphering, by means of the DES algorithm, data to be written to or read from a hard disk

EP 0556928 B1 · Applicant: TULIP COMPUTERS INTERNATIONAL B.V.

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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 February 18, 1993 and granted January 7, 1998. A European patent lasts at most 20 years from filing, so its term ended February 18, 2013.
  • 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 18, 2018.
  • 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 18, 1993
PublishedAugust 25, 1993
GrantedJanuary 7, 1998
Term endedFebruary 18, 2013
Application numberEP 93200470
Classification (CPC)G06F21/62 +1 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedFeb 18, 1993PublishedAug 25, 1993Patent grantedJan 7, 1998Term endedFeb 18, 2013

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.