Patents by Inventor Yegnaswami Raghunathan

Yegnaswami Raghunathan 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).

  • Coating barriers comprising ethyl cellulose
    Patent number: 4959219
    Abstract: Coatings for individual ion exchange resin particles comprised of (a) ethylcellulose and (b) corn oil or acetylated monoglycerides.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: September 25, 1990
    Assignee: Fisons Corporation
    Inventors: San-Laung Chow, Yegnaswami Raghunathan
  • Polymer-treated ion exchange resins
    Patent number: 4859462
    Abstract: Sulfonic acid cationic exchange resin particles which have been treated to improve their coatability with minor amounts of high molecular weight polymers selected from carboxypolymethylene, xanthan gum, and propylene glycol alginate.
    Type: Grant
    Filed: May 4, 1987
    Date of Patent: August 22, 1989
    Assignee: Fisons Corporation
    Inventors: San-Laung Chow, Yegnaswami Raghunathan
  • Coatable ion exchange resins
    Patent number: 4859461
    Abstract: Sulfonic acid cationic exchange resin particles which have been treated to improve their coatability with up to about 20% by weight of a compound selected from hydroxypropylmethyl cellulose, hydroxypropyl cellulose, hydroxypropyl sorbitol, sorbitol, and polyvinylpyrrolidone.
    Type: Grant
    Filed: May 4, 1987
    Date of Patent: August 22, 1989
    Assignee: Fisons Corporation
    Inventors: San-Laung Chow, Yegnaswami Raghunathan
  • Controlled release pharmaceutical preparations
    Patent number: 4847077
    Abstract: Controlled release pharmaceutical preparations containing coated sulfonic acid cationic exchange resin drug complex particles, the resin particles having been treated, prior to coating, with about 15 to 25% by weight of glycerin, based on the combined weight of the glycerin and the drug resin complex particles.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: July 11, 1989
    Assignee: Pennwalt Corporation
    Inventor: Yegnaswami Raghunathan
  • Diuretic/antihypertensive compositions
    Patent number: 4522818
    Abstract: A combination tablet containing metolazone and triamterene is useful in diuretic therapy and the treatment of hypertension. The composition is advantageous in the prevention of hypokalemia, a common side effect of diuretic therapy and possesses enhanced dissolution properties. Proper selection of the excipient formulation permits preparation of the tablets by direct compression.
    Type: Grant
    Filed: October 14, 1982
    Date of Patent: June 11, 1985
    Assignee: Pennwalt Corporation
    Inventor: Yegnaswami Raghunathan
  • Prolonged release pharmaceutical preparations
    Patent number: 4221778
    Abstract: Prolonged release pharmaceutical preparations containing ion exchange resin drug complexes at least a substantial portion of which have been treated with a solvating agent and provided with a diffusion barrier coating.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: September 9, 1980
    Assignee: Pennwalt Corporation
    Inventor: Yegnaswami Raghunathan