Dimmer and ground fault interruption for solid state neon supply
CA 2109785 C · Owner: Everbrite, Inc. · Inventors: Pacholok, David R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for dimming neon tubes and signs in which certain problems associated with high dimming levels (lowered illumination intensities) namely, of, tube non-excitation and non-uniform illumination are eliminated. The , apparatus, includes a generator for creating pulse groups which groups consist of one or , more, high frequency full-amplitude pulses and a modulator for selectively controlling the, repetition rate of the pulse group and/or the number of pulses forming each group. The apparatus further includes ground fault interruption circuitry that is immune, from the false triggering occasioned by the low pulse group repetition rate which, in turn results in the repeated …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed November 23, 1993 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.