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Expired European patentEurope

Instant acoustic logging method for well bores

EP 0706668 B1 · Applicant: ELF AQUITAINE PRODUCTION

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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 April 26, 1995 and granted October 6, 1999. A European patent lasts at most 20 years from filing, so its term ended April 26, 2015.
  • 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 October 26, 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.
FiledApril 26, 1995
PublishedApril 17, 1996
GrantedOctober 6, 1999
Term endedApril 26, 2015
Application numberEP 95918645
Classification (CPC)G01V1/42

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedApril 26, 1995PublishedApril 17, 1996Patent grantedOct 6, 1999Term endedApril 26, 2015

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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