Method and apparatus for heat treating metal castings
CA 2103136 C · Owner: Crafton, Paul M. · Inventors: Crafton, Scott P.; Crafton, Paul M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method and apparatus for heat treating a metal casting having a sand core comprising a heat treating furnace (11), with fans (44) for directing a flow of air over the casting to dislodge the sand core. The dislodged sand falls into a trough (50) where it is collected and conveyed to a central collection bin (60) for reuse.
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 April 15, 1992 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 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.