Patent Yard Sign in
Expired European patentEurope

Process and apparatus for reprocessing waste sulfuric acid, acid sludges, etc. of various compositions and consistencies

EP 0029583 B1 · Applicant: Grillo-Werke AG

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 19, 1980 and granted November 24, 1982. A European patent lasts at most 20 years from filing, so its term ended November 19, 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 May 19, 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.
FiledNovember 19, 1980
PublishedJune 3, 1981
GrantedNovember 24, 1982
Term endedNovember 19, 2000
Application numberEP 80107194
Classification (CPC)C01B21/02 +1 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedNov 19, 1980PublishedJune 3, 1981Patent grantedNov 24, 1982Term endedNov 19, 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.