Vacuum impulse forming of heated glass sheets
CA 2081561 C · Owner: Glasstech, Inc. · Inventors: Hersch, Christopher 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 (20, 120) for forming a heated glass sheet G is disclosed as including a vacuum mold (22, 22a, 122, 122a) having a full surface (24, 24a, 124, 124a) against which a peripheral mold (26 26a, 126, 126a) presses the glass sheet periphery and with which at least one vacuum reservoir (32 33) is communicated within the , interior of the sealed glass sheet periphery to form the glass sheet to the shape of the vacuum mold surface. Valving (38) of a vacuum system (28) is preferably operable to provide the vacuum impulse in two stages with an initial limited extent of vacuum and a subsequent greater extent of vacuum by communication first with one vacuum reservoir (32) and subsequently …
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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 July 25, 2000. 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.