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Expired European patentEurope

Apparatus for suppression of spurious attenuation poles in crystal filters

EP 0156808 B1 · Applicant: MOTOROLA, INC.

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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 April 12, 1984 and granted March 6, 1991. A European patent lasts at most 20 years from filing, so its term ended April 12, 2004.
  • 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 October 12, 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.
FiledApril 12, 1984
PublishedOctober 9, 1985
GrantedMarch 6, 1991
Term endedApril 12, 2004
Application numberEP 84901862
Classification (CPC)H03H9/56

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedApril 12, 1984PublishedOct 9, 1985Patent grantedMarch 6, 1991Term endedApril 12, 2004

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

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