Method of producing glyoxylated hydroxypropyl guar and liquid plant treatment composition containing same
CA 2002507 C · Owner: Carter, Walter H. · Inventors: Carter, Walter H.; Lauderdale, Clifton H.; Srivastava, Vinai K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid fertilizer composition having a substantial ability to retard leaching of constituent plant nutrients is prepared by dispersing glyoxylated hydroxypropyl guar in an aqueous mixture containing a fertilizer chemical in a preferred concentration of 0.4-1.5% by weight. Similarly a, liquid herbicide, fungicide, insecticide fire retardant or other liquid plant, treatment composition having the ability to adhere to applied surfaces to resist washing is prepared by dispersing glyoxylated hydroxypropyl guar in an aqueous mixture of such a plant treatment chemical in a corresponding concentration. A method is disclosed for producing glyoxylated hydroxypropyl guar by reacting guar gum with …
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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 8, 1989 and granted February 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 8, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 2011.
- 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.