System to control variable transmission windows
CA 2633620 C · Owner: Bechtel, Jon H. · Inventors: Poll, David L.; Bechtel, Jon H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrical control system is disclosed for controlling a plurality of variable transmittance windows. To achieve these and other aspects and advantages the electrical control system of the present invention comprises a master control circuit for supplying control signals representing transmittance levels for the variable transmission windows a sensing circuit for sensing an abnormal electrical load condition in the variable transmission window and a security system interface coupled to receive an indication from the sensing circuit that an abnormal electrical load condition exists in the variable transmission window. Also disclosed are several window constructions that enable variable …
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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 July 12, 2001 and granted March 13, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 12, 2023.
- 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.