Functional fluids
CA 2030694 C · Owner: Albright & Wilson Limited · Inventors: Nicholson, William John; Grover, Boyd William; Blezard, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aqueous Structured Surfacatants, e.g. lamellar or preferably, spherulitic systems optionally containing suspended solids are used as Functional Fluids, such as Drilling Fluids Cutting Fluids, Hydraulic, Fluids, Heat Transfer Fluids Construction Muds and Lubricants.
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 November 27, 1990 and granted April 7, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 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.