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Expired European patentEurope

Dielectric filter having an attenuation pole tunable to a predetermined frequency

EP 0364931 B1 · Applicant: Oki Electric Industry Co., Ltd.

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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 October 16, 1989 and granted August 24, 1994. A European patent lasts at most 20 years from filing, so its term ended October 16, 2009.
  • 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 April 16, 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.
FiledOctober 16, 1989
PublishedApril 25, 1990
GrantedAugust 24, 1994
Term endedOctober 16, 2009
Application numberEP 89119190
Classification (CPC)H01P1/2056

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedOct 16, 1989PublishedApril 25, 1990Patent grantedAug 24, 1994Term endedOct 16, 2009

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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