Countergravity casting apparatus and method
CA 2011370 C · Owner: Chandley, George D. · Inventors: Chandley, George D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and method for vacuum, countergravity casting of molten metal wherein a gas permeable, self-supporting mold is supported in an inverted casting position in an open bottom container with a particulate bed compacted about the mold. The mold may comprise a mold stack having a plurality of mold members stacked side-by-side to form a plurality of mold cavities therebetween. The particulate bed may comprise loose, unbonded particulate compacted in-situ about the mold to support the mold stack in the container and press the mold members sealingly together before, during and after filling with molten metal.
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 March 2, 1990 and granted April 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 2, 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.