Glassmelting method and reduced volatilization of alkali species
CA 2178863 C · Owner: Kobayashi, Hisashi · Inventors: Kobayashi, Hisashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A glassmelting method wherein fuel and oxidant combust in a combustion zone in the upper level of a furnace and shield oxygen is passed over the molten glass surface at a low velocity to form a shield layer between the combustion zone and the molten glass to, counteract the reaction of water vapor resulting from, the combustion, with species within the molten glass to reduce volatilization of alkali species from the molten glass, and to make the molten glass more oxidizing. Reducing gas may be used in place of shield oxygen to make the molten glass more reducing. Both shield oxygen and reducing gas may be used sequentially in a multi-zone furnace.
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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 June 12, 1996 and granted November 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 12, 2018.
- 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.