Patent Yard Sign in
Expired European patentEurope

Variable orifice gas lift valve for high flow rates with detachable power source and method of using

EP 1279795 B1 · Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed August 15, 1997 and granted May 14, 2008. A European patent lasts at most 20 years from filing, so its term ended August 15, 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 February 15, 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.
FiledAugust 15, 1997
PublishedJanuary 29, 2003
GrantedMay 14, 2008
Term endedAugust 15, 2017
Application numberEP 02079411
Classification (CPC)E21B34/066 +1 more

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedAug 15, 1997PublishedJan 29, 2003Patent grantedMay 14, 2008Term endedAug 15, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.