Expired Canadian patentCanada
Foundry shell core and mold compositions
CA 1297740 C · Owner: Borden, Inc. · Inventors: Armbruster, David R.; Johnson, Calvin K.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A foundry shell core and mold composition comprises particulate matter coated with a curable phenolic-furan resin. The process for making the resin coated particulate matter substantially eliminates the use of hexamethylene tetramine. 8/3-16
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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 March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 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.
FiledMay 20, 1987
GrantedMarch 24, 1992
Term endedMarch 24, 2009
Patent numberCA 1297740 C
Classification (IPC)B22C1/22 +1 more
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.