Grey glass compositions of the soda-lime type
CA 2398693 C · Owner: Berthereau, Anne · Inventors: Sachot, Dominique; Berthereau, Anne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a grey glass composition of the soda-lime type having a global light transmission under an illuminant A (T¿LA?) more than 15 % for a glass thickness equal to 4.85 mm said composition comprising colouring agents as follows in the following weight percentage limits: Fe¿2?O¿3?: 0.25-0.65 % preferably 0.3-0.6 % and more preferably still 0.3-0.4 %; CoO: 150-250 ppm and preferably > 185 ppm; NiO: 650-1000 ppm; Se < 5 ppm.
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 February 9, 2001 and granted September 27, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 9, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 9, 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.