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Expired European patentEurope

Process for the preparation of hydroxylammonium salts

EP 0002178 B1 · Applicant: BASF Aktiengesellschaft

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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 September 22, 1978 and granted August 5, 1981. A European patent lasts at most 20 years from filing, so its term ended September 22, 1998.
  • 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 March 22, 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.
FiledSeptember 22, 1978
PublishedJune 13, 1979
GrantedAugust 5, 1981
Term endedSeptember 22, 1998
Application numberEP 78100973
Classification (CPC)C01B21/1418

Timeline

Timeline From EPO dates

1979198119831985198719891991199319951997Application filedSep 22, 1978PublishedJune 13, 1979Patent grantedAug 5, 1981Term endedSep 22, 1998

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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