A method of making glass
CA 2196153 A1 · Owner: Eaves, Helen Louise · Inventors: Eaves, Helen Louise; Cochrane, Thomas Gordon; Fyles, Kenneth Melvin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of making glass in which a first glass composition is fed to a furnace and the densities of such glass is determined. The composition is then changed to produce a second glass which has substantially different properties from the first glass the change to the, composition being such that the desired properties are produced in the second glass whilst simultaneously maintaining the densities of the second glass substantially equal to that of the second glass. The first glass may be a clear glass whilst the second glass may be a tinted glass. In such a case the tinted glass may contain iron and the densities are maintained substantially equal by utilising the iron to replace calcium …
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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 January 28, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 28, 2019.
- 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.