Patents by Inventor Subbu S. Venktrama

Subbu S. Venktrama 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).

  • Transdermal drug delivery device using a polymer-filled microporous membrane to achieve delayed onset
    Patent number: 5273755
    Abstract: A delayed onset transdermal drug delivery device exhibiting a delay period of at least six hours comprising a laminated composite of (12) a top backing layer; (13) a pressure rupturable layer underlying (12); (14) a reservoir of a solution of drug in a liquid vehicle between (12) and (13); (16) a wick layer underlying (13) for dispersing the drug once (13( is ruptured; (17) a polymer layer underlying (16) that is permeable to the drug; (18) a microporous membrane underlying (17) which is itself impermeable to the drug but whose pores are filled with a polymer that is immiscible in the adhesive and has a solubility parameter within two units of the solubility parameter of the vehicle; and (20) an adhesive layer underlying (18) that is permeable to the drug but is immiscible in the polymer filling the pores of (6).
    Type: Grant
    Filed: August 23, 1991
    Date of Patent: December 28, 1993
    Assignee: Cygnus Therapeutic Systems
    Inventors: Subbu S. Venktrama, Renee A. Fallon, Gary W. Cleary