Glass sheet forming utilizing lower full surface vacuum mold and upper ring mold
CA 2081563 C · Owner: Shetterly, Donivan M. · Inventors: Mcmaster, Ronald A.; Shetterly, Donivan M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus (38) and a method for forming a flat glass sheet is disclosed as utilizing a heating conveyor (42) that transfers a heated flat glass sheet to a downwardly facing surface (46) of a topside transfer device (44) a lower mold (48) having an upwar-, dly facing full surface (50) at least a portion of which has an upwardly convex shape that receives the heated flat glass sheet from the topside transfer device, and an upper ring mold (52) that forms and seals the periphery of the heated glass sheet against the vacuum mold surface (50) at which a vacuum is supplied within the sealed periphery of the glass sheet to form the entire extent of the glass sheet to the vacuum mold surface. A …
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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 March 28, 1991 and granted March 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2013.
- 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.