Patents by Inventor Thomas C. Usher

Thomas C. Usher 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: 7235536
    Abstract: The invention relates to the treating, inhibiting or preventing of certain infectious agents including papilloma virus and various vaginitis-causing microbes by employing cellulose sulfate and other sulfated polysaccharides. In one embodiment, the method involves preventing, inhibiting or treating fungal infections. Corresponding methods of use in manufacturing a medicament as well as use in preventing and inhibiting various infectious agents as well as malignant lesions are disclosed. In another embodiment, use of a sulfated polysaccharide in preventing, inhibiting or treating a parasitic infection is disclosed.
    Type: Grant
    Filed: December 1, 2004
    Date of Patent: June 26, 2007
    Assignees: Rush Presbyterian-St. Luke's Medical Center, Polydex Pharmaceuticals Limited
    Inventors: Lourens J. D. Zaneveld, Robert A. Anderson, Thomas C. Usher
  • Patent number: 7226914
    Abstract: A method for treating and preventing various infections, including papilloma virus and fungal and parasitic infections is provided. In particular, an effective amount of a sulphated polysaccharide, such as cellulose sulphate and dextran sulphate are administered to prevent and treat these infections. The invention also relates to use of these compounds for the prevention and inhibition of malignant epithelial lesions associated with papilloma virus, such as cervical cancer.
    Type: Grant
    Filed: December 1, 2004
    Date of Patent: June 5, 2007
    Assignees: Rush Presbyterian-St. Luke's Medical Center, Polydex Pharmaceuticals Limited
    Inventors: Lourens J. D. Zaneveld, Robert A. Anderson, Thomas C. Usher
  • Patent number: 7078392
    Abstract: A method for treating and preventing various infections, including papilloma virus and fungal and parasitic infections is provided. In particular, an effective amount of a sulfated polysaccharide, such as cellulose sulfate and dextran sulfate are administered to prevent and treat these infections. The invention also relates to use of these compounds for the prevention and inhibition of malignant epithelial lesions associated with papilloma virus, such as cervical cancer.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: July 18, 2006
    Assignees: Polydex Pharmaceuticals Limited, Rush-Presbyterian-St. Luke's Medical Center
    Inventors: Lourens J. D. Zaneveld, Robert A. Anderson, Thomas C. Usher
  • Patent number: 6703499
    Abstract: The present invention provides a process of preparing a novel carboxylic acid derivative of dextran. In particular, in the present invention, carboxylated dextran containing at least one carboxylic acid is reduced to remove all or substantially all reducing groups.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: March 9, 2004
    Assignee: Polydex Pharmaceuticals Ltd.
    Inventors: Thomas C. Usher, Simon H. Wallis
  • Publication number: 20030181415
    Abstract: A method for treating and preventing various infections, including papilloma virus and fungal and parasitic infections is provided. In particular, an effective amount of a sulfated polysaccharide, such as cellulose sulfate and dextran sulfate are administered to prevent and treat these infections. The invention also relates to use of these compounds for the prevention and inhibition of malignant epithelial lesions associated with papilloma virus, such as cervical cancer.
    Type: Application
    Filed: December 19, 2002
    Publication date: September 25, 2003
    Inventors: Louren J D Zaneveld, Robert A Anderson, Thomas C Usher
  • Patent number: 6063773
    Abstract: The present invention relates to a method of reducing the risk of infections and the risk of conception. In particular, the invention relates to cellulose sulfate having contraceptive and anti-microbial properties. Cellulose sulfate may be administered in appropriate dosage forms to reduce the risk of infections or the risk of conception. It can also be used during sexual contact to concomitantly reduce the risk of conception and the risk of sexually transmitted diseases.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: May 16, 2000
    Assignees: Polydex Pharmaceuticals Ltd., Rush-Presbyterian-St. Luke's Medical Center
    Inventors: Robert A. Anderson, Lourens J. D. Zaneveld, Thomas C. Usher
  • Patent number: 5514665
    Abstract: Methods for reducing the risk of or preventing infections by bacterial pathogens in vivo. In particular, a method for reducing the risk of P. aeruginosa infection in vivo in compromised hosts such as cystic fibrosis patients. The methods involve the use of dextran or dextran sulphate as the active ingredient.
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: May 7, 1996
    Assignee: University of British Columbia
    Inventors: David P. Speert, Thomas C. Usher
  • Patent number: 5378828
    Abstract: The present invention provides a process for the preparation of water soluble alkali metal salts of cellulose sulfate having a degree of substitution ranging from 1 to 3 and viscosity of 1 percent aqueous solution in excess of 20 centipoises (cps). The process involves the use of chlorosulfuric acid as a sulfonating agent in the presence of pyridine used as a solvent in reaction. The important steps of the process for preparation of the water soluble salts include presoaking of the cellulose in pyridine followed by washing the pyridine salt with an alcohol such as methanol and reacting saturated alkali metal bicarbonate or carbonate solutions with the sulfonated cellulose.
    Type: Grant
    Filed: September 2, 1993
    Date of Patent: January 3, 1995
    Assignee: Dextran Products Limited
    Inventors: Thomas C. Usher, Natu Patel, Chhagan G. Tele
  • Patent number: 4855416
    Abstract: A method for the preparation of dextran sulfate and salts thereof which comprises first forming a complex between sulfur trioxide and formamide at a controlled temperature between 15.degree.-40.degree. C. in the presence of dry nitrogen gas and thereafter reacting said complex with dextran at a controlled temperature between 25.degree.-55.degree. C.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: August 8, 1989
    Assignee: Polydex Pharmaceuticals, Ltd
    Inventor: Thomas C. Usher
  • Patent number: 4784986
    Abstract: Cosmetic preparations comprising water soluble fatty acid amide derivatives of hydrolyzed collagen are found to have a substantial degree of permeability to the stratum corneum of human skin and to be effective in improving skin texture, moisture retention and minimizing wrinkles.
    Type: Grant
    Filed: October 30, 1986
    Date of Patent: November 15, 1988
    Assignee: Polydex Pharmaceuticals Ltd.
    Inventor: Thomas C. Usher
  • Patent number: 4659740
    Abstract: This invention relates to a cosmetic preparation which comprises novel derivatives of solubilized elastin which are fatty acid amides of elastin, and which have been found to permit deeper penetration and a higher percentage absorption of elastin into the stratum corneum of human skin.
    Type: Grant
    Filed: February 14, 1985
    Date of Patent: April 21, 1987
    Assignee: Polydex Pharmaceuticals Ltd.
    Inventor: Thomas C. Usher
  • Patent number: 4507472
    Abstract: This invention relates to an improved process for the manufacture of diethylaminoethyl dextran (DEAE dextran) and the diethylaminoethyl derivative of hydrogenated dextran (DEAE hydrodextran). A product of greater purity and improved color is obtained by the addition of a borohydride, such as sodium borohydride during manufacture to generate hydrogen in situ during the reaction.
    Type: Grant
    Filed: June 14, 1983
    Date of Patent: March 26, 1985
    Inventors: Thomas C. Usher, Natu Patel
  • Patent number: 4370476
    Abstract: The present invention relates to novel dextran derivatives having a plurality of carboxylic acid groups positioned upon intermediate glucose or glucopyranose units of the dextran polymer, and substances formed therefrom by complexing or chelation with colloidal ferric hydroxide to produce stable products of low intravenous toxicity and containing a relatively high iron content. It further relates to a process for producing said polycarboxylic acid compounds as well as the ferric hydroxide complexes described.
    Type: Grant
    Filed: October 23, 1980
    Date of Patent: January 25, 1983
    Inventors: Thomas C. Usher, Izu Hattori