Glass feeders
CA 2103240 C · Owner: Stanley, George Michael · Inventors: Stanley, George Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A basin (3) for the forehearth of a glass-making furnace has its internal volume devided into upper (10) and lower (11) portions by means of an annular shoulder with the horizontal cross-sectional , area of the upper portion being significantly greater than that of the lower portion. The base of the basin (3) has in it a glassdischarge outlet (4). When in use, the outlet (4) hay aligned with it a relatively-movable cylinder (6) acting as a flow-metering valve. The cylinder (6) may be rotated about its axis at a constant or adjustable speed, or it may be non-rotary and have a separatelydriven stirrer movable about it to prevent or reduce the formation of stagnant areas.
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 May 18, 1992 and granted February 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 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.