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Expired European patentEurope

Aphron-containing oil base fluids and method of drilling a well therewith

EP 1161511 B1 · Applicant: Masi Technologies L.L.C.

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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 27, 1999 and granted September 15, 2004. A European patent lasts at most 20 years from filing, so its term ended December 27, 2019.
  • 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 June 27, 2025.
  • 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 27, 1999
PublishedDecember 12, 2001
GrantedSeptember 15, 2004
Term endedDecember 27, 2019
Application numberEP 99966691
Classification (CPC)C09K8/32 +2 more

Timeline

Timeline From EPO dates

2000200220042006200820102012201420162018Application filedDec 27, 1999PublishedDec 12, 2001Patent grantedSep 15, 2004Term endedDec 27, 2019

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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