Patent Yard Sign in
Expired European patentEurope

Triple distillation column nitrogen generator with plural reboiler/condensers

EP 0476989 B1 · Applicant: AIR PRODUCTS AND CHEMICALS, INC.

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 September 18, 1991 and granted October 6, 1993. A European patent lasts at most 20 years from filing, so its term ended September 18, 2011.
  • 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 March 18, 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.
FiledSeptember 18, 1991
PublishedMarch 25, 1992
GrantedOctober 6, 1993
Term endedSeptember 18, 2011
Application numberEP 91308499
Classification (CPC)F25J3/04448 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedSep 18, 1991PublishedMarch 25, 1992Patent grantedOct 6, 1993Term endedSep 18, 2011

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.