Patent Yard Sign in
Expired European patentEurope

Process for the purification of crude sec. butyl alcohol by distillation

EP 0304770 B1 · Applicant: RWE-DEA Aktiengesellschaft für Mineraloel und Chemie

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 16, 1988 and granted December 27, 1991. A European patent lasts at most 20 years from filing, so its term ended August 16, 2008.
  • 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 16, 2014.
  • 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 16, 1988
PublishedMarch 1, 1989
GrantedDecember 27, 1991
Term endedAugust 16, 2008
Application numberEP 88113269
Classification (CPC)C07C29/82

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedAug 16, 1988PublishedMarch 1, 1989Patent grantedDec 27, 1991Term endedAug 16, 2008

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.