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Expired European patentEurope

Photo cathode and method of manufacturing such a cathode

EP 0127735 B1 · Applicant: DORNIER SYSTEM GmbH

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Overview

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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 17, 1984 and granted November 19, 1987. A European patent lasts at most 20 years from filing, so its term ended March 17, 2004.
  • 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 17, 2009.
  • 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 17, 1984
PublishedDecember 12, 1984
GrantedNovember 19, 1987
Term endedMarch 17, 2004
Application numberEP 84102976
Classification (CPC)H01J1/34 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMarch 17, 1984PublishedDec 12, 1984Patent grantedNov 19, 1987Term endedMarch 17, 2004

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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