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Expired European patentEurope

Thermally-compensated microwave resonator utilizing variable current-null segmentation

EP 0155296 B1 · Applicant: Hughes Aircraft Company

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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 June 4, 1984 and granted March 7, 1990. A European patent lasts at most 20 years from filing, so its term ended June 4, 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 December 4, 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.
FiledJune 4, 1984
PublishedSeptember 25, 1985
GrantedMarch 7, 1990
Term endedJune 4, 2004
Application numberEP 84903381
Classification (CPC)H01P7/06 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedJune 4, 1984PublishedSep 25, 1985Patent grantedMarch 7, 1990Term endedJune 4, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.