Non-toxic ethylene glycol-based antifreeze/heat transfer fluid concentrate and antifreeze/heat transfer fluid
CA 2421813 C · Owner: Light, J. Thomas · Inventors: Evans, John W.; Light, J. Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A non-harzardous, reduced toxicity ethylene glycol-based antifreeze/heat transfer fluid concentrate is provided comprised of ethylene glycol an , antidote for ethylene glycol poisoning such as propylene glycol, and selected additives. The antifreeze/heat transfer fluid concentrate may be combined with water to form a coolant solution for use in internal combustion engines.
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 June 8, 2001 and granted May 28, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 8, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 8, 2023.
- 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.