Method of heating glass sheet for laminated glass
CA 2017174 C · Owner: Yoshizawa, Hideo · Inventors: Nagai, Yasuyuki; Yoshizawa, Hideo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
First and second glass sheets, which are to be combined together into a single laminated glass sheet are, heated in a heating furnace so that the temperature of the first glass sheet at the exit of the heating furnace and the temperature of the second glass sheet at the exit of the heating furnace are substantially equal to each other.
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 May 18, 1990 and granted December 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2012.
- 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.