Security power interrupt
CA 2177945 C · Owner: Keizer, Daniel James · Inventors: Keizer, Daniel James; Muylwyk, Robert K.; Lax, Steven A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A security electrical interrupt device (10) for preventing unauthorized usage of an electrical appliance (11) such as an electric stove while retaining operation of auxiliary electrical equipment such as the lights and an electrical clock. The device (10) comprises a relay (33) controlled by a micro-processor based programmable controller (26) which measures the amount of electrical supply current drawn by the appliance (11). A software computer program stored in the microcontroller (26) commands the relay (33) to disconnect the supply power if any person attempts to operate any part of the appliance (11) which draws electrical current exceeding a present limit while the controller (26) is …
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 December 21, 1994 and granted June 6, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2016.
- 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.