Feeder sleeves
CA 1304560 C · Owner: Butler, David Richard · Inventors: Butler, David Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A feeder sleeve for use in the casting of molten metal, particularly molten ferrous metal has fixed in its cavity a filter located at least 0.5 cm from its lower end. The filter is preferably located above the lower end of the sleeve by at least 10% and no more than 75% of the height of the sleeve. The sleeve may be formed from exothermic and/or heat-insulating material and the filter is preferably a ceramic foam.
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
- Granted July 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 2009.
- 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.