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Expired European patentEurope

Process for regenerating a cooking liquor from a waste magnesium bisulphite cooking liquor, and filter apparatus for carrying out the process

EP 0207070 B1 · Applicant: Lenzing Aktiengesellschaft

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Overview

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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.

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Why it's free to use

  • Filed June 19, 1986 and granted April 15, 1992. A European patent lasts at most 20 years from filing, so its term ended June 19, 2006.
  • 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 December 19, 2011.
  • 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.
FiledJune 19, 1986
PublishedDecember 30, 1986
GrantedApril 15, 1992
Term endedJune 19, 2006
Application numberEP 86890182
Classification (CPC)B01D46/04 +2 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedJune 19, 1986PublishedDec 30, 1986Patent grantedApril 15, 1992Term endedJune 19, 2006

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

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