Production of anionic surfactant granules
CA 2196303 C · Owner: Metcalfe, Kenneth · Inventors: Tollington, Peter James; Emery, William Derek; Metcalfe, Kenneth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing granules of anionic surfactant preferably PAS by , heating an aqueous paste of the surfactant to a temperature in excess of 130 ~C and subsequently cooling the feedstock to provide surfactant granules detergent particles obtainable by the process and compositions containing them are disclosed.
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 August 19, 1995 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 19, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 19, 2017.
- 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.