Patents Examined by Shep R. Rose
  • Polymeric diffusion matrix
    Patent number: 4466953
    Abstract: A polymeric diffusion matrix is provided comprising from about 2 to about 60% glycerol, from about 2 to about 15% polyvinylalcohol, from about 2 to about 10% water soluble polymer with hydration sites which in combination with the remaining ingredients yields a matrix capable of sustained release of a drug dispersed therein, and the balance water, the percentages being by weight.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: August 21, 1984
    Assignee: Key Pharmaceuticals, Inc.
    Inventors: Alec D. Keith, Wallace Snipes