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Expired European patentEurope

Electrochemical removal of material, particularly excess emitter material in electron-emitting device

EP 0885452 B1 · Applicant: Candescent Intellectual Property Services, Inc.

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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 March 5, 1997 and granted October 8, 2003. A European patent lasts at most 20 years from filing, so its term ended March 5, 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 September 5, 2022.
  • 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.
FiledMarch 5, 1997
PublishedDecember 23, 1998
GrantedOctober 8, 2003
Term endedMarch 5, 2017
Application numberEP 97916717
Classification (CPC)H01J9/025

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedMarch 5, 1997PublishedDec 23, 1998Patent grantedOct 8, 2003Term endedMarch 5, 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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