Degassing apparatus for mold
CA 2004157 A1 · Owner: Kuriyama, Minoru · Inventors: Kuriyama, Minoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A degassing apparatus for a mold includes a degassing valve, an acoustic wave detecting unit and a, valve closing unit. The degassing valve is located at an end portion of a degassing passage extending from a mold cavity. The acoustic wave detecting unit is arranged midway along the degassing passage and detects an acoustic wave generated when a molten metal collides against a wall surface of the passage, and thereby detecting passing of the molten metal. The valve closing unit closes the valve when a detection signal level is higher than a reference signal level.
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 November 29, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2011.
- 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.