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Expired European patentEurope

Nitric acid hydrolysis of polyamides

EP 0833809 B1 · Applicant: E.I. DU PONT DE NEMOURS AND COMPANY

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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 13, 1996 and granted December 29, 1999. A European patent lasts at most 20 years from filing, so its term ended June 13, 2016.
  • 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 13, 2021.
  • 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 13, 1996
PublishedApril 8, 1998
GrantedDecember 29, 1999
Term endedJune 13, 2016
Application numberEP 96922469
Classification (CPC)C07C51/06

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedJune 13, 1996PublishedApril 8, 1998Patent grantedDec 29, 1999Term endedJune 13, 2016

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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