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Expired European patentEurope

Signal encryption

EP 0378446 B1 · Applicant: Webb, Joseph Alfred

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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 15, 1990 and granted July 3, 1996. A European patent lasts at most 20 years from filing, so its term ended January 15, 2010.
  • 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 15, 2015.
  • 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 15, 1990
PublishedJuly 18, 1990
GrantedJuly 3, 1996
Term endedJanuary 15, 2010
Application numberEP 90300407
Classification (CPC)H04K1/00

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedJan 15, 1990PublishedJuly 18, 1990Patent grantedJuly 3, 1996Term endedJan 15, 2010

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.