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Expired European patentEurope

Synthesis of methyl t-butyl ether using Group IV oxides treated with sulfates or sulfuric acid

EP 0506428 B1 · Applicant: TEXACO CHEMICAL 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 March 26, 1992 and granted June 21, 1995. A European patent lasts at most 20 years from filing, so its term ended March 26, 2012.
  • 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 September 26, 2017.
  • 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.
FiledMarch 26, 1992
PublishedSeptember 30, 1992
GrantedJune 21, 1995
Term endedMarch 26, 2012
Application numberEP 92302667
Classification (CPC)C07C41/09

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedMarch 26, 1992PublishedSep 30, 1992Patent grantedJune 21, 1995Term endedMarch 26, 2012

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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