Patent Yard Sign in
Expired European patentEurope

Variable control, current sensing ballast

EP 0577975 B1 · Applicant: LESTICIAN BALLAST Inc.

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed June 3, 1993 and granted March 18, 1998. A European patent lasts at most 20 years from filing, so its term ended June 3, 2013.
  • 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 December 3, 2018.
  • 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.
FiledJune 3, 1993
PublishedJanuary 12, 1994
GrantedMarch 18, 1998
Term endedJune 3, 2013
Application numberEP 93108950
Classification (CPC)H05B41/2855 +1 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedJune 3, 1993PublishedJan 12, 1994Patent grantedMarch 18, 1998Term endedJune 3, 2013

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.