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Expired European patentEurope

Method for increasing production from a wellbore

EP 1497530 B1 · Applicant: WEATHERFORD/LAMB, INC.

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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 6, 2003 and granted August 5, 2009. A European patent lasts at most 20 years from filing, so its term ended February 6, 2023.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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 6, 2003
PublishedJanuary 19, 2005
GrantedAugust 5, 2009
Term endedFebruary 6, 2023
Application numberEP 03707764
Classification (CPC)E21B43/25 +2 more

Timeline

Timeline From EPO dates

2004200620082010201220142016201820202022Application filedFeb 6, 2003PublishedJan 19, 2005Patent grantedAug 5, 2009Term endedFeb 6, 2023

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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