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Method for the determination of hydrocarbon containing underground layers

EP 0444576 A2 · Applicant: PRAKLA-SEISMOS GmbH

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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 February 25, 1991 and never granted as a European patent. Had it been granted, its 20-year term would have ended February 25, 2011.
  • 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 August 25, 2016.
  • 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.
FiledFebruary 25, 1991
PublishedSeptember 4, 1991
GrantedNever granted
Term endedFebruary 25, 2011
Application numberEP 91102745
Classification (CPC)G01V1/303

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedFeb 25, 1991PublishedSep 4, 1991Term endedFeb 25, 2011

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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