Patent Yard Sign in
Expired European patentEurope

Invert well service fluid and method

EP 1280975 B1 · Applicant: HALLIBURTON ENERGY SERVICES, INC.

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 January 22, 2001 and granted February 27, 2013. A European patent lasts at most 20 years from filing, so its term ended January 22, 2021.
  • 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 July 22, 2026.
  • 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.
FiledJanuary 22, 2001
PublishedFebruary 5, 2003
GrantedFebruary 27, 2013
Term endedJanuary 22, 2021
Application numberEP 01951159
Classification (CPC)C09K8/58 +2 more

Timeline

Timeline From EPO dates

2002200420062008201020122014201620182020Application filedJan 22, 2001PublishedFeb 5, 2003Patent grantedFeb 27, 2013Term endedJan 22, 2021

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.