Reduction of nickel sulfide stones in a glass melting operation
CA 2129086 C · Owner: Pecoraro, George Anthony · Inventors: Pecoraro, George Anthony; Jones, James Victor; Mishra, Amarendra
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Material selected from the group consisting essentially of molybdenum, arsenic, antimony bismuth, copper, silver, potassium dichromate and iron chromite is added, during the manufacture of soda-lime-silica float glass to reduce the occurrences of nickel sulfide stone defects. Material is added in sufficient amounts such that the resulting glass is at least 0.010 wt. % of the selected material. In a preferred embodiment of the invention molybdenum is added in the form of sodium molybdate such that the resulting glass is at least 0.015 wt. % molybdenum.
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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 July 28, 1994 and granted November 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 28, 2016.
- 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.