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Expired European patentEurope

Protection circuitry for a commutating transistor

EP 0321663 B1 · Applicant: Lenze GmbH & Co. KG Aerzen

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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 1, 1988 and granted September 15, 1993. A European patent lasts at most 20 years from filing, so its term ended October 1, 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 1, 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 1, 1988
PublishedJune 28, 1989
GrantedSeptember 15, 1993
Term endedOctober 1, 2008
Application numberEP 88116306
Classification (CPC)H02H9/04 +2 more

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedOct 1, 1988PublishedJune 28, 1989Patent grantedSep 15, 1993Term endedOct 1, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.