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Expired European patentEurope

An improved method for reverberation suppression

EP 0666992 B1 · Applicant: WESTERN ATLAS INTERNATIONAL, INC.

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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 July 13, 1994 and granted August 25, 1999. A European patent lasts at most 20 years from filing, so its term ended July 13, 2014.
  • 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 January 13, 2020.
  • 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.
FiledJuly 13, 1994
PublishedAugust 16, 1995
GrantedAugust 25, 1999
Term endedJuly 13, 2014
Application numberEP 94923411
Classification (CPC)G01V1/3808 +2 more

Timeline

Timeline From EPO dates

1995199719992001200320052007200920112013Application filedJuly 13, 1994PublishedAug 16, 1995Patent grantedAug 25, 1999Term endedJuly 13, 2014

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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