Patent Yard Sign in
Expired European patentEurope

Apparatus and method for treating an aggregate material with a flowing gas

EP 0028149 B1 · Applicant: Johnson, Frances Hedrick

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 October 24, 1980 and granted January 15, 1986. A European patent lasts at most 20 years from filing, so its term ended October 24, 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 April 24, 2006.
  • 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.
FiledOctober 24, 1980
PublishedMay 6, 1981
GrantedJanuary 15, 1986
Term endedOctober 24, 2000
Application numberEP 80303793
Classification (CPC)F27B7/2016

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedOct 24, 1980PublishedMay 6, 1981Patent grantedJan 15, 1986Term endedOct 24, 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.