Patents Examined by Sharon E. Rose
  • Dosage form for delivering acid sensitive beneficial agent
    Patent number: 4743248
    Abstract: A dosage form is disclosed, which dosage form comprises an outside wall and an inside wall, which inside wall comprises means for changing its structural integrity in response to fluid having a pH greater than 5 that enters the dosage form, thereby changing the pH environment inside the dosage form and concomitantly causing the inside wall to change its structural integrity, thus causing the outside wall to collapse and be easily eliminated from a host.
    Type: Grant
    Filed: August 11, 1986
    Date of Patent: May 10, 1988
    Assignee: ALZA Corporation
    Inventors: Marc L. Bartoo, Patrick S. L. Wong, Felix Theeuwes, Brian Barclay