Detergent manufacture
CA 2185085 C · Owner: Roberts, David William · Inventors: Adams, Amanda Jane; Roberts, David William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to provide an acid of the formula RO(XO)n SO3H, where R denotes a straight or branched primary alkyl group containing 8 to 22 carbon atoms, XO denotes an alkylene oxide residue containing from 2 t 4 carbon atoms and n is an average value which may be zero, in a form which can be stored for extended periods of time, the corresponding primary alcohol of formula, RO(XO)n H, is sulphated acid and the product from the sulphation reaction is diluted with water so as to produce a solution in which the said acid is in either the micellar or lamellar phases.
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 September 9, 1996 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 9, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 2018.
- 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.