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).

  • Publication number: 20200390805
    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 16, 2020
    Publication date: December 17, 2020
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20200281871
    Abstract: The present invention relates to novel tetrahydrocurcumin (THCu) compositions, novel methods of manufacturing, and methods of using these compositions for therapeutic applications. The novel synthetic pathway(s) result in THCu compositions that generally lack hexahydrocurcumin (HHC), and include an improved impurity profile with reduced additional species that are generally present in hydrogenated curcumin compositions.
    Type: Application
    Filed: March 6, 2020
    Publication date: September 10, 2020
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM, Bhupinder SINGH, Richard A. ZAGER
  • Publication number: 20200277325
    Abstract: The present invention involves a novel aqueous iron composition. The aqueous iron composition includes iron sucrose and bicarbonate. The aqueous iron composition of the invention exhibits enhanced renal protective effects relative to conventional iron sucrose compositions.
    Type: Application
    Filed: February 28, 2020
    Publication date: September 3, 2020
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM, Richard A. ZAGER
  • Patent number: 10695365
    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: Grant
    Filed: January 23, 2018
    Date of Patent: June 30, 2020
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Patent number: 10695366
    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: Grant
    Filed: March 19, 2018
    Date of Patent: June 30, 2020
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Publication number: 20200171051
    Abstract: The present invention relates to methods for treating acute kidney injury that utilize a glucocorticoid prodrug. The glucocorticoid prodrug selectively delivers a glucocorticoid to the kidney, where it is capable of eliciting a p21 protective response. The present invention also contemplates several novel glucocorticoid prodrugs capable of use in the above manner.
    Type: Application
    Filed: November 27, 2019
    Publication date: June 4, 2020
    Inventors: Richard A. ZAGER, Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20200057076
    Abstract: The p21 biomarker is utilized in the evaluation of whether a patient is suffering from kidney injury or failure, and can be used in methods of treating kidney injury or failure by determining the appropriateness of one or more of initiating renal replacement therapy, withdrawing delivery of compounds that are known to be damaging to the kidney, delaying or avoiding procedures that are known to be damaging to the kidney, and modifying diuretic administration.
    Type: Application
    Filed: May 24, 2019
    Publication date: February 20, 2020
    Inventors: Richard A. ZAGER, Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20190365800
    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: May 17, 2019
    Publication date: December 5, 2019
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Patent number: 10413569
    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: April 21, 2015
    Date of Patent: September 17, 2019
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Patent number: 10398730
    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: August 13, 2015
    Date of Patent: September 3, 2019
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Patent number: 10335432
    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: September 1, 2016
    Date of Patent: July 2, 2019
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem, Jeff Gilmore
  • Patent number: 10300087
    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: January 31, 2017
    Date of Patent: May 28, 2019
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Publication number: 20180271902
    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: March 19, 2018
    Publication date: September 27, 2018
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20180214479
    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: January 23, 2018
    Publication date: August 2, 2018
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20180207350
    Abstract: The present invention relates to novel microporous zirconium silicate compositions having a desired particle size distribution and methods of making those compositions. These compositions have an ideal particle size distribution for use ex vivo, for example in a dialysis exchange cartridge, yet retain many of the desirable properties of prior improved absorbers including high cation exchange capacity. Further, the new zirconium silicate molecular sieve absorbers can be manufactured using a technique that achieves the desired particle size distribution while eliminating the screening step that was previously necessary.
    Type: Application
    Filed: March 19, 2018
    Publication date: July 26, 2018
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Publication number: 20180125884
    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: November 8, 2017
    Publication date: May 10, 2018
    Inventors: Donald Jeffrey KEYSER, Alvaro F. GUILLEM
  • Patent number: 9943637
    Abstract: The present invention relates to novel microporous zirconium silicate compositions having a desired particle size distribution and methods of making those compositions. These compositions have an ideal particle size distribution for use ex vivo, for example in a dialysis exchange cartridge, yet retain many of the desirable properties of prior improved absorbers including high cation exchange capacity. Further, the new zirconium silicate molecular sieve absorbers can be manufactured using a technique that achieves the desired particle size distribution while eliminating the screening step that was previously necessary.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: April 17, 2018
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Patent number: 9913860
    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: Grant
    Filed: February 20, 2015
    Date of Patent: March 13, 2018
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Patent number: 9861658
    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: August 13, 2015
    Date of Patent: January 9, 2018
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem
  • Patent number: 9844567
    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: December 19, 2017
    Assignee: ZS PHARMA, INC.
    Inventors: Donald Jeffrey Keyser, Alvaro F. Guillem