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Expired European patentEurope

Electrical surface wave filter

EP 0187918 B1 · Applicant: SIEMENS AKTIENGESELLSCHAFT

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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 November 18, 1985 and granted July 24, 1991. A European patent lasts at most 20 years from filing, so its term ended November 18, 2005.
  • 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 May 18, 2011.
  • 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.
FiledNovember 18, 1985
PublishedJuly 23, 1986
GrantedJuly 24, 1991
Term endedNovember 18, 2005
Application numberEP 85114644
Classification (CPC)H03H9/02629 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedNov 18, 1985PublishedJuly 23, 1986Patent grantedJuly 24, 1991Term endedNov 18, 2005

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.