Waste fire suppression control device
CA 2287475 C · Owner: O'Leary, James · Inventors: O'Leary, James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a waste fire suppression control device which is attached to the base of a conventional garbage chute system. The device comprises and incorporates a sequence of two control doors. One door is a main control door which is pivotally mounted at the base of the device and which is biased towards a closed position. The main control door opens only when the weight or force of garbage on the top surface of the door is greater than a pre-determined release force. The other door is a closing plate which is held open during normal operation of the device and closes either automatically in response to elevated temperature or manually. The two control doors together …
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 October 28, 1999 and granted April 12, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2021.
- 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.