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Expired European patentEurope

Carbonation process for the manufacture of sodium bicarbonate

EP 0005981 B1 · Applicant: STAUFFER CHEMICAL COMPANY

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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 May 29, 1979 and granted September 15, 1982. A European patent lasts at most 20 years from filing, so its term ended May 29, 1999.
  • 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 November 29, 2004.
  • 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.
FiledMay 29, 1979
PublishedDecember 12, 1979
GrantedSeptember 15, 1982
Term endedMay 29, 1999
Application numberEP 79300967
Classification (CPC)C01D7/00

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedMay 29, 1979PublishedDec 12, 1979Patent grantedSep 15, 1982Term endedMay 29, 1999

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.