Electrochromic windows and method of manufacturing the same
CA 2663705 C · Owner: Poll, David L. · Inventors: Guarr, Thomas F.; Tonar, William L.; Poll, David L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A window includes an electrochromic medium having a color stability .DELTA.E less than 5 measured in its low transmission state after exposure to 700 hours in a weatherometer while cycling and a color stability .DELTA.E less than 5 measured in its high transmission state after exposure to 700 hours in a weatherometer while cycling wherein each cycle consists of application of sufficient potential for a sufficient time such that the window reaches its low transmission state for at least 210 hours. A method for making an electrochromic device for use in such a window is also provided.
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 July 23, 2001 and granted December 12, 2017. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 23, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 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.