Process for removing malodors from modified polyamines
CA 2257945 A1 · Owner: Graves, Sharon Anne · Inventors: Graves, Sharon Anne; Gosselink, Eugene Paul; Hutchins, James Peyton
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods for deodorizing polyamines useful as laundry detergent adjuncts especially as cotton soil release agents are described. The methods involve , contacting the polyamines with water at a temperature higher than the boiling point of water, contacting the polyamines with a non-condensable gas and , mixtures thereof.
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 17, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2019.
- 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.