Patents by Inventor Donald Jeffrey Keyser

Donald Jeffrey Keyser 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).

  • Patent number: 9707255
    Abstract: The present invention relates to novel calcium-containing microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without removing calcium from the patient's body. Also disclosed are methods of using calcium-free or low calcium microporous zirconium silicate compositions for the treatment of hyperkalemia in patients also suffering from hypercalcemia.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: July 18, 2017
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Publication number: 20170151279
    Abstract: The present invention relates to zirconium silicate compositions having a lead content that is below 0.6 ppm and methods of manufacturing zirconium silicate at reactor volumes exceeding 200-L with a lead content below 1.1 ppm. The lead content of the zirconium silicate of this invention are within the levels that are considered acceptable for extended use given the dose requirements for zirconium silicate.
    Type: Application
    Filed: January 31, 2017
    Publication date: June 1, 2017
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Patent number: 9662352
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of UZSi-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: May 30, 2017
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Patent number: 9592253
    Abstract: The present invention relates to zirconium silicate compositions having a lead content that is below 0.6 ppm and methods of manufacturing zirconium silicate at reactor volumes exceeding 200-L with a lead content below 1.1 ppm. The lead content of the zirconium silicate of this invention are within the levels that are considered acceptable for extended use given the dose requirements for zirconium silicate.
    Type: Grant
    Filed: October 14, 2015
    Date of Patent: March 14, 2017
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Publication number: 20170007543
    Abstract: The invention relates to a novel pharmaceutical sustained release formulation of guaifenesin. The formulation may comprise a hydrophilic polymer, preferably a hydroxypropyl methylcellulose, and a water-insoluble polymer, preferably an acrylic resin, in a ratio range of about one-to-one (1:1) to about nine-to-one (9:1), more preferably a range of about three-to-two (3:2) to about six-to-one (6:1), and most preferably in a range of about two-to-one (2:1) to about four-to-one (4:1) by weight. This formulation capable of providing therapeutically effective bioavailability of guaifenesin for at least twelve hours after dosing in a human subject. The invention also relates to a modified release product which has two portions: a first portion having an immediate release formulation of guaifenesin and a second portion having a sustained release formulation of guaifenesin.
    Type: Application
    Filed: September 12, 2016
    Publication date: January 12, 2017
    Inventors: Robert D. Davis, Ralph W. Blume, Donald Jeffrey Keyser
  • Publication number: 20160375054
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of ZS-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia. These compositions are also useful in the treatment of chronic kidney disease, coronary vascular disease, diabetes mellitus, and transplant rejection.
    Type: Application
    Filed: November 7, 2014
    Publication date: December 29, 2016
    Inventors: Donald Jeffrey KEYSER, Alvaro F. Guillem
  • Publication number: 20160367598
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of UZSi-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.
    Type: Application
    Filed: September 1, 2016
    Publication date: December 22, 2016
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM, Jeff GILMORE
  • Patent number: 9457050
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of UZSi-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: October 4, 2016
    Assignee: ZS Pharma, Inc.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem, Jeff Gilmore
  • Publication number: 20160271174
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of ZS-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia. These compositions are also useful in the treatment of chronic kidney disease, coronary vascular disease, diabetes mellitus, and transplant rejection.
    Type: Application
    Filed: November 7, 2014
    Publication date: September 22, 2016
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20160051584
    Abstract: The present invention relates to novel methods of using microporous zirconium silicate to reduce the risk of hyperkalemia and to lower aldosterone levels in the treatment of chronic kidney disease and/or chronic heart disease with therapies comprising diuretics. The invention provides a safe way to reduce the risk of hyperkalemia and to lower aldosterone. The invention also relates to treatment of other conditions that can occur either alone or in connection with hyperkalemia, chronic kidney disease, and/or chronic heart disease.
    Type: Application
    Filed: April 3, 2014
    Publication date: February 25, 2016
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20160038538
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred composition has at least 95% ZS-9. These compositions are particularly useful in the therapeutic treatment of hyperkalemia. These compositions are also useful in the treatment of chronic kidney disease, coronary vascular disease, diabetes mellitus, and transplant rejection.
    Type: Application
    Filed: October 26, 2015
    Publication date: February 11, 2016
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20160000825
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of UZSi-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.
    Type: Application
    Filed: August 13, 2015
    Publication date: January 7, 2016
    Inventors: Donald Jeffrey KEYSER, Alvaro F. Guillem
  • Publication number: 20150374748
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred composition has at least 95% ZS-9. These compositions are particularly useful in the therapeutic treatment of hyperkalemia. These compositions are also useful in the treatment of chronic kidney disease, coronary vascular disease, diabetes mellitus, and transplant rejection.
    Type: Application
    Filed: June 26, 2015
    Publication date: December 31, 2015
    Inventors: Donald Jeffrey KEYSER, Alvaro F. Guillem
  • Publication number: 20150359821
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred composition has at least 95% ZS-9. These compositions are particularly useful in the therapeutic treatment of hyperkalemia. These compositions are also useful in the treatment of chronic kidney disease, coronary vascular disease, diabetes mellitus, and transplant rejection.
    Type: Application
    Filed: August 13, 2015
    Publication date: December 17, 2015
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Publication number: 20150342988
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of UZSi-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.
    Type: Application
    Filed: August 13, 2015
    Publication date: December 3, 2015
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20150313938
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. The present invention also relates to the use of the microporous zirconium silicate compositions in the treatment of diseases, where the subject is not concurrently receiving lithium based drugs. Also disclosed is a method for preparing high purity crystals of ZS-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.
    Type: Application
    Filed: December 10, 2014
    Publication date: November 5, 2015
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20150290242
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred composition has at least 95% ZS-9. These compositions are particularly useful in the therapeutic treatment of hyperkalemia. These compositions are also useful in the treatment of chronic kidney disease, coronary vascular disease, diabetes mellitus, and transplant rejection.
    Type: Application
    Filed: November 7, 2014
    Publication date: October 15, 2015
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20150250821
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of ZS-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.
    Type: Application
    Filed: February 20, 2015
    Publication date: September 10, 2015
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20150225249
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of UZSi-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.
    Type: Application
    Filed: April 21, 2015
    Publication date: August 13, 2015
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20150196592
    Abstract: The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patent. Also disclosed is a method for preparing high purity crystals of UZSi-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.
    Type: Application
    Filed: March 31, 2015
    Publication date: July 16, 2015
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem