Hydrant thawing machine
CA 2015672 C · Owner: Regional Municipality Of Ottawa-Carleton · Inventors: Ross, Max A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A machine for thawing fire hydrants and the like. Within a thermally insulated cabinet, on a truck or trailer are housed a, water reservoir tank, a water heater a delivery hose to extend, from within the cabinet into a hydrant body a circulating system, and pump for delivering water from the heater (water delivered to the delivery hose to be at a predetermined pressure and temperature), a nozzle at the end of the delivery hose for vaporizing water leaving the hose into steam a suction hose to, extend from within the cabinet into the hydrant body a suction, pump associated with the suction hose to enable withdrawal of water collecting at the bottom of the hydrant body through the suction …
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 April 27, 1990 and granted August 2, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2012.
- 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.