Method and apparatus for pressing hollow blanks from glass
CA 2019293 A1 · Owner: Trier, Wolfgang · Inventors: Trier, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus for pressing hollow blanks from glass, Hollow blanks from glass are pressed between a hollow mold and a plunger (10). The mold comprises an inner wall complementary to the outer side of a blank. The plunger (10) comprises an open-pore plunger head (11) having a surface (24) complementary to the inner side of the blank and an inner cavity (16) which is filled with a liquid. In each working cycle a partial amount of the liquid evaporates by heat transfer from the glass to the plunger head (11) at the surface (24) of the latter, a separating vapour layer forming between said surface and the glass. The liquid pressure in the cavity (15) of the plunger head (11) is adapted …
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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 June 19, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2012.
- 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.