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Expired European patentEurope

A method and apparatus for determining the electrical conductivity of the ground

EP 0030218 B1 · Applicant: Boliden Aktiebolag

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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 28, 1980 and granted February 12, 1986. A European patent lasts at most 20 years from filing, so its term ended November 28, 2000.
  • 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 28, 2006.
  • 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 28, 1980
PublishedJune 10, 1981
GrantedFebruary 12, 1986
Term endedNovember 28, 2000
Application numberEP 80850180
Classification (CPC)G01V3/165

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedNov 28, 1980PublishedJune 10, 1981Patent grantedFeb 12, 1986Term endedNov 28, 2000

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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