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Expired European patentEurope

High voltage sphere-gap discharge switch, high voltage pulse generation circuit and high voltage discharge switching method

EP 0668643 B1 · Applicant: Nippon Paint Co., Ltd.

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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 February 15, 1995 and granted May 7, 1997. A European patent lasts at most 20 years from filing, so its term ended February 15, 2015.
  • 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 August 15, 2020.
  • 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.
FiledFebruary 15, 1995
PublishedAugust 23, 1995
GrantedMay 7, 1997
Term endedFebruary 15, 2015
Application numberEP 95300965
Classification (CPC)H01T2/00 +1 more

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedFeb 15, 1995PublishedAug 23, 1995Patent grantedMay 7, 1997Term endedFeb 15, 2015

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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