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Expired European patentEurope

Block-cipher cryptographic device based upon a pseudorandom nonlinear sequence generator

EP 0443752 B1 · Applicant: GENERAL INSTRUMENT CORPORATION OF DELAWARE

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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 6, 1991 and granted November 8, 1995. A European patent lasts at most 20 years from filing, so its term ended February 6, 2011.
  • 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 6, 2016.
  • 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 6, 1991
PublishedAugust 28, 1991
GrantedNovember 8, 1995
Term endedFebruary 6, 2011
Application numberEP 91300986
Classification (CPC)H04L9/0625 +1 more

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.