Improved combination steam and fuel oil supply and purge valve with recirculation feature
CA 2058293 C · Owner: Buchanan, Joseph R. · Inventors: Buchanan, Joseph R.; Buchanan, Bascom Frank
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved combination steam and fuel oil supply and purge valve has a steam valve (42) and actuator member (48) which provides for a closed position, a purge operation with communication established between a steam supply line (26) and a discharge line (28) leading to an oil burner, and a burner operation position wherein the actuator portion (48) of the member engages and opens a double acting oil supply and recirculation valve member (78) and thus establishes communication between an oil supply line (92) and an oil discharge line (40) to the burner. In its closed position the oil supply line and recirculation valve member (104) provides for communication between the oil supply line (92) …
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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 March 4, 1991 and granted September 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 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.