Patent Yard Sign in
European application, no grantEurope

Improved process and system for purifying brown phosphoric acid

EP 0015809 A2 · Applicant: CALGON CORPORATION

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 February 20, 1980 and never granted as a European patent. Had it been granted, its 20-year term would have ended February 20, 2000.
  • 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 August 20, 2005.
  • 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.
FiledFebruary 20, 1980
PublishedSeptember 17, 1980
GrantedNever granted
Term endedFebruary 20, 2000
Application numberEP 80400241
Classification (CPC)C01B25/235

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedFeb 20, 1980PublishedSep 17, 1980Term endedFeb 20, 2000

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.