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Expired European patentEurope

NOx reduction method in corona discharge pollutant destruction apparatus

EP 0824952 B1 · Applicant: HE HOLDINGS, INC. dba HUGHES ELECTRONICS

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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 August 19, 1997 and granted July 16, 2003. A European patent lasts at most 20 years from filing, so its term ended August 19, 2017.
  • 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 February 19, 2023.
  • 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.
FiledAugust 19, 1997
PublishedFebruary 25, 1998
GrantedJuly 16, 2003
Term endedAugust 19, 2017
Application numberEP 97306290
Classification (CPC)B01D53/32

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedAug 19, 1997PublishedFeb 25, 1998Patent grantedJuly 16, 2003Term endedAug 19, 2017

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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