Glass compositions
CA 2107946 A1 · Owner: Pilkington Plc · Inventors: Fyles, Kenneth M.; Bartlett, David R.; Dickinson, Clive F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for manufacturing a glass composition suitable for use as a face plate far a cathode ray tube said process including, the steps of melting a batch of glass-forming components refining the molten glass, and and forming the molten glass on a bath of molten tin into a finished glass composition in flat sheet form, wherein the melting and refining of the batch of glass-forming components is performed in the presence of a source of SO3 which acts as a primary refining agent together with at least one of:, (a) strontium titanate which acts as a foam de-stabiliser or, (b) an alkaline earth metal sulphide or, (c) sulphur as auxiliary refining agents. Glass compositions for use as face …
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 October 7, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 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.