Expired Canadian patentCanada
Soda-lime-silica glass compositions and applications
CA 2257673 C · Owner: El Khiati, Nathalie · Inventors: Le Bourhis, Eric; Gy, Rene; El Khiati, Nathalie
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a soda-lime-silica glass composition for the manufacture of substrates or panes said composition having a coefficient ? ranging from 0.50 to 0.85 N/(mm?2¿·C) and a working temperature lower than 1200 ·C.
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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 March 12, 1998 and granted December 6, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 12, 1998
GrantedDecember 6, 2011
Term endedMarch 12, 2018
Patent numberCA 2257673 C
Classification (IPC)C03C3/08 +2 more
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.