Fully automatic energy efficient lighting control and method of making same
CA 2096839 C · Owner: Novitas, Inc. · Inventors: Elwell, Brian E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fully automatic and energy efficient lighting control or light switch (2 150) comprises different settings, preset by a user and activates all or a portion of at least one bank of lights (300 320) upon , detecting occupants within a room. In one embodiment, the light switch detects doppler-shifted reflected ultrasonic waves , caused by occupant motion within the room. In an automatic mode, the light switch (2, 150) is configured to automatically switch from an initial sensitivity level for detecting motion within a short range (260) therefrom, to a higher sensitivity level for detecting motion anywhere within the room. After the room is empty or no motion is sensed, the light switch (2 …
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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 27, 1991 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2013.
- 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.