Patents by Inventor Leslie L. Carstens

Leslie L. Carstens has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Controlled release fertilizer employing epoxidized fatty acid triglyceride oil as a coating additive
    Patent number: 10202314
    Abstract: A controlled release fertilizer material comprising a particulate plant nutrient surrounded by at least one coating comprising the reaction product of a mixture comprising a polyol, an isocyanate, a wax and an epoxidized fatty acid triglyceride oil.
    Type: Grant
    Filed: August 9, 2006
    Date of Patent: February 12, 2019
    Assignee: Agrium, Inc.
    Inventors: Baozhong Xing, Leslie L. Carstens, Nick P. Wynnyk
  • Controlled release fertilizers made from cross-linked glyceride mixtures
    Patent number: 8790437
    Abstract: A controlled release fertilizer material comprising a particulate plant nutrient surrounded by a coating which is the reaction product of a mixture including a cross-linked polyol, an isocyanate and a wax is described. The cross-linked polyol is a reaction product of a polyhydroxyl compound, such as glycerol, and a triglyceride and the monoglyceride and/or diglyceride products are cross-linked with sulfur, oxygen and/or a peroxide cross-linking moiety, or are directly cross-linked at unsaturated sites in the monoglycerides and/or diglycerides.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: July 29, 2014
    Assignee: Agrium Advanced Technologies (U.S.) Inc.
    Inventors: Romem Avdala, Leslie L. Carstens, Garrard Lee Hargrove, Sriramakrishna Maruvada, Baozhong Xing
  • CONTROLLED RELEASE FERTILIZERS MADE FROM CROSS-LINKED GLYCERIDE MIXTURES
    Publication number: 20120111076
    Abstract: A controlled release fertilizer material comprising a particulate plant nutrient surrounded by a coating which is the reaction product of a mixture including a cross-linked polyol, an isocyanate and a wax is described. The cross-linked polyol is a reaction product of a polyhydroxyl compound, such as glycerol, and a triglyceride and the monoglyceride and/or diglyceride products are cross-linked with sulfur, oxygen and/or a peroxide cross-linking moiety, or are directly cross-linked at unsaturated sites in the monoglycerides and/or diglycerides.
    Type: Application
    Filed: November 8, 2011
    Publication date: May 10, 2012
    Applicant: Agrium Advanced Technologies
    Inventors: ROMEM AVDALA, Leslie L. Carstens, Garrard Lee Hargrove, Sriramakrishna Maruvada, Baozhong Xing
  • CONTROLLED RELEASE FERTILIZER EMPLOYING EPOXIDIZED FATTY ACID TRIGLYCERIDE OIL AS A COATING ADDITIVE
    Publication number: 20100307211
    Abstract: A controlled release fertilizer material comprising a particulate plant nutrient surrounded by at least one coating comprising the reaction product of a mixture comprising a polyol, an isocyanate, a wax and an epoxidized fatty acid triglyceride oil.
    Type: Application
    Filed: August 9, 2006
    Publication date: December 9, 2010
    Applicant: AGRIUM INC.
    Inventors: Baozhong Xing, Leslie L. Carstens, Nick P. Wynnyk
  • Controlled release fertilizer and method for production thereof
    Publication number: 20040020254
    Abstract: A controlled release fertilizer material comprising a particulate plant nutrient surrounded by a coating comprising at least one substantially homogeneous layer of a urethane-containing compound and an organic additive. With appropriate selection of the additive, the shape and duration of the release profile can be modified to suit a wide variety of applications.
    Type: Application
    Filed: August 2, 2002
    Publication date: February 5, 2004
    Applicant: Agrium
    Inventors: Nick P. Wynnyk, Eugene G. Stelmack, Nicolette M. Babiak, Leslie L. Carstens, Baozhong Xing, Albert J. Geiger, J. David Eastham
  • Controlled release fertilizer having improved mechanical handling durability and method for production thereof
    Publication number: 20040016276
    Abstract: A controlled release fertilizer material comprising a particulate plant nutrient surrounded by a protective coating comprising at least one substantially homogeneous layer of a urethane-containing compound and a filler(s). An organic additive(s) may or may not be present.
    Type: Application
    Filed: July 26, 2002
    Publication date: January 29, 2004
    Inventors: Nick P. Wynnyk, Eugene G. Stelmack, Nicolette M. Babiak, Leslie L. Carstens, J. David Eastham, Baozhong Xing
  • Process for the recovery of phosphate from phosphate rock
    Patent number: 6562308
    Abstract: There is disclosed a wet process for the recovery of phosphate from phosphate rock which comprises leaching finely divided particles of phosphate rock with a protic acid at a temperature and for a time that favours dissolution, into a leachate, of the phosphate in relation to an impurity, and, isolating the leachate. An appropriate combination of particle size, leach time and leach temperature can achieve high phosphate recovery while reducing the amount of impurities.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: May 13, 2003
    Assignee: Agrium, Inc.
    Inventors: Leslie L. Carstens, Nick P. Wynnyk