Respective inflatable arbors for making backdraft cavity in sand core and for forming part of core lift device insertable in cavity
CA 2235188 C · Owner: Deere & Company · Inventors: Durchenwald, Larry Don
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tooling including an inflatable arbor is provided for forming a backdraft cavity in a foundry sand core. A core handling device includes an inflatable arbor similar to the one, used for forming the backdraft cavity in the sand core whereby the lifting device arbor, when in its deflated state may be inserted into the backdraft cavity of the sand core and then inflated to grip and become locked to the sand core.
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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
- Filed May 15, 1998 and granted February 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 15, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 15, 2020.
- 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.