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Expired European patentEurope

Method for the determination of inflow of oil and/or gas into a well

EP 0816631 B1 · Applicant: Norsk Hydro ASA

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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 June 24, 1997 and granted June 1, 2005. A European patent lasts at most 20 years from filing, so its term ended June 24, 2017.
  • 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 December 24, 2022.
  • 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.
FiledJune 24, 1997
PublishedJanuary 7, 1998
GrantedJune 1, 2005
Term endedJune 24, 2017
Application numberEP 97110279
Classification (CPC)E21B43/119 +2 more

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedJune 24, 1997PublishedJan 7, 1998Patent grantedJune 1, 2005Term endedJune 24, 2017

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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