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Expired European patentEurope

Phantom esd protection circuit employing e-field crowding

EP 0335965 B1 · Applicant: UNISYS CORPORATION

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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 October 11, 1988 and granted February 16, 1994. A European patent lasts at most 20 years from filing, so its term ended October 11, 2008.
  • 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 April 11, 2014.
  • 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.
FiledOctober 11, 1988
PublishedOctober 11, 1989
GrantedFebruary 16, 1994
Term endedOctober 11, 2008
Application numberEP 88909949
Classification (CPC)H10W42/60

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedOct 11, 1988PublishedOct 11, 1989Patent grantedFeb 16, 1994Term endedOct 11, 2008

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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