Glass composition
CA 2344159 A1 · Owner: Pilkington Plc · Inventors: Butcher, Louise Sara; Torr, Ashley Carl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high performance green glass composition containing at least 14.5 % by weight Na2O, at least 10.5 % by weight CaO at least 0.5 % by weight total , iron (measured as Fe2O3) and is substantially magnesium-free the glass thus , produced having a ferrous value of at least 30 % and a performance (light transmission minus Direct Solar Heat Transmission) of at least 28 % at at least one thickness of 2.8 mm to 5 mm. The invention also relates to glasses made from such composition and to a laminated glass assembly in which two sheets of glass sandwich a polymeric material at least one, preferably both, of the sheets of glass having such a composition.
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 November 12, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2021.
- 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.