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Expired European patentEurope

Method and apparatus for measuring total nuclear magnetic resonance porosity

EP 0871045 B1 · Applicant: SCHLUMBERGER LIMITED

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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 March 16, 1998 and granted January 9, 2008. A European patent lasts at most 20 years from filing, so its term ended March 16, 2018.
  • 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 September 16, 2023.
  • 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.
FiledMarch 16, 1998
PublishedOctober 14, 1998
GrantedJanuary 9, 2008
Term endedMarch 16, 2018
Application numberEP 98400616
Classification (CPC)G01V11/00 +2 more

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedMarch 16, 1998PublishedOct 14, 1998Patent grantedJan 9, 2008Term endedMarch 16, 2018

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

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