Heat treating furnace and method
CA 2203097 C · Owner: Willett, Gordon H. · Inventors: Willett, Gordon H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat treating furnace including a housing defining a chamber, a heavy high thermal capacity cast link endless conveyor belt positioned within the chamber for moving articles to be heat treated through the chamber a, narrow elongated vestibule passage extending forwardly from the chamber, and a light low thermal capacity wire mesh endless belt conveyor extending from a furnace loading location forwardly of the vestibule passage through the vestibule passage to a location within the chamber in vertically spaced overlying relation to the forward end portion of the cast link conveyor. The vestibule passage minimizes loss of heat treating atmosphere from the furnace chamber, and curtains are …
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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 April 18, 1997 and granted October 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 18, 2019.
- 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.