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Expired European patentEurope

Method of increasing the low shear rate viscosity of well drilling and servicing fluids containing calcined magnesia bridging solids, the fluids and methods of use

EP 1698677 B1 · Applicant: Texas United Chemical Company, LLC.

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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 December 12, 2005 and granted March 7, 2012. A European patent lasts at most 20 years from filing, so its term ended December 12, 2025.
  • 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.
FiledDecember 12, 2005
PublishedSeptember 6, 2006
GrantedMarch 7, 2012
Term endedDecember 12, 2025
Application numberEP 05257604
Classification (CPC)C09K8/08 +1 more

Timeline

Timeline From EPO dates

2006200820102012201420162018202020222024Application filedDec 12, 2005PublishedSep 6, 2006Patent grantedMarch 7, 2012Term endedDec 12, 2025

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

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