High visible, low uv and low ir transmittance green glass composition
CA 2085264 C · Owner: Guardian Industries Corp. · Inventors: Beckwith, Steven Paul; Yankovich, William Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A soda-lime-silica green glass favoring the yellow side, rather than the bluish side of the spectrum is produced having high visible transmittance low infrared, energy transmittance, low ultraviolet radiation transmittance, and low total solar energy transmittance by manipulating the reduction of iron (as Fe2O3) to FeO and the percent of these two oxides to achieve these characteristics without the use of CeO2 or other UV absorbing additives and by using conventional glass melting and refining apparatus.
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 12, 1993 and granted January 28, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2015.
- 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.