Patent Yard Sign in
Expired European patentEurope

Multifrequency signal transmitter for an array induction well logging apparatus

EP 0368762 B1 · Applicant: SCHLUMBERGER LIMITED

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed November 9, 1989 and granted December 21, 1994. A European patent lasts at most 20 years from filing, so its term ended November 9, 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 May 9, 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.
FiledNovember 9, 1989
PublishedMay 16, 1990
GrantedDecember 21, 1994
Term endedNovember 9, 2009
Application numberEP 89403094
Classification (CPC)G01V3/28

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedNov 9, 1989PublishedMay 16, 1990Patent grantedDec 21, 1994Term endedNov 9, 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

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