Antifreeze compositions
CA 1195486 A · Owner: Shell Canada Limited · Inventors: Wood, Donald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A single-phase glycol-based antifreeze composition having superior performance in multi-metal corrosion protection which contains certain silicate, phosphate, borate nitrate, azole, and, alkali compounds in specified proportions. Such compositions are of particular advantage in inhibiting the corrosion of aluminium surfaces at elevated antifreeze service temperatures.
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
- Granted October 22, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 22, 2002.
- 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.