Compressed air blowing apparatus for use in green sand mold molding facility
CA 2057197 C · Owner: Sintokogio Ltd. · Inventors: Oishi, Ukichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compressed air blowing apparatus for supplying compressed air to molding sand placed in a flask is arranged in such a manner that its compressed air reservoir tank is constituted by a surface-plate frame and a cover, the frame having a compressed-air cutlet part which can be opened/closed by a sectioning device and a piston which can be vertically moved. The sectioning device is constituted by concentrically disposed large and small cylindrical members by a cover member secured to the large and small cylindrical members having air feed holes formed between said large cylindrical member and said small cylindrical member and by connecting duct for communicating the outside of the …
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 December 6, 1991 and granted July 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 2013.
- 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.