Patents by Inventor Ingrid Zhang

Ingrid Zhang 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).

  • Enhancer tolerant pressure sensitive adhesives for transdermal drug delivery
    Patent number: 6077527
    Abstract: Pressure sensitive adhesive compositions for use in transdermal drug delivery systems comprising an adhesive composition which is tolerant to plasticization by cutaneous penetration enhancers contained in the transdermal drug formulation are disclosed. Specifically, the pressure sensitive adhesive composition of the present invention comprises an acrylic copolymer prepared from (i) at least 40% by weight of th total monomer composition of alkyl acrylate monomers with a Tg of -90 to 0.degree. C., (ii) 0-15% by weight of the total monomer composition of monomers with a Tg of 0 to 250.degree. C., and (iii) 10-60% by weight of the total monomer composition of substituted acrylamides or methacrylamides having the structural formula: ##STR1## wherein R.sub.1 is H or CH.sub.3,R.sub.2 is H or CH.sub.3, andR.sub.3 is (a) CH.sub.3,(b) C(CH.sub.3).sub.2 --(CH.sub.2).sub.n --CH.sub.3 where n is 0 through 17, or(c) substituents of the formula: ##STR2## where m is 0 through 10, and optionally(iv) at least 0.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: June 20, 2000
    Assignee: National Starch and Chemical Investment Holding Corporation
    Inventors: Hock S. Tan, Ingrid Zhang, Susan Lydzinski, Peter L. Merkel, Paul Foreman, Smita Shah, Rama S. Chandran