Bending glass sheets between a bottom outline mold and an upper vacuum press face
CA 2058729 A1 · Owner: Ppg Industries, Inc. · Inventors: Reese, Thomas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus for shaping one or more glass sheets by supporting the glass sheet(s) on an outline mold having an upwardly facing outline shaping surface constructed and arranged to support the glass sheet's perimeter, heat sagging said glass sheet to conform its periphery to the upwardly facing outline shaping surface and continuing to support said sagged glass sheet on the outline shaping surface while simultaneously engaging the upper major surface of the heat softened glass sheet throughout essentially its entire extent against the downward facing full-faced shaping surface of a vacuum mold to develop a final desired shape onto the glass sheet.
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 January 3, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 3, 2014.
- 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.