Patent Yard Sign in
Expired European patentEurope

High efficiency packed column supercritical fluid chromatography

EP 0551594 B1 · Applicant: Hewlett-Packard Company

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 November 25, 1992 and granted February 21, 1996. A European patent lasts at most 20 years from filing, so its term ended November 25, 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 May 25, 2018.
  • 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.
FiledNovember 25, 1992
PublishedJuly 21, 1993
GrantedFebruary 21, 1996
Term endedNovember 25, 2012
Application numberEP 92120106
Classification (CPC)G01N30/28 +1 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedNov 25, 1992PublishedJuly 21, 1993Patent grantedFeb 21, 1996Term endedNov 25, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.