Patents by Inventor Jack T. Irwin

Jack T. Irwin 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).

  • Tablets exhibiting reduced drug release variability
    Patent number: 7897172
    Abstract: A compressible extended release tablet or tablet layer having a drug release profile that is not strongly dependent on tablet hardness may be prepared by dry blending a pharmaceutically active ingredient with hydroxypropyl methylcellulose, wherein the hydroxypropyl methylcellulose has a bimodal or multimodal number average molecular weight distribution that includes at least one mode over 20,000 Daltons and at least one mode under 10,000 Daltons. An additional advantage of the invention is that the tablet formulations may be prepared without resort to wet granulation.
    Type: Grant
    Filed: May 18, 2004
    Date of Patent: March 1, 2011
    Assignee: L. Perrigo Company
    Inventors: Jaber G. Qasem, Sumner H. Cathcart, Jack T. Irwin
  • Pseudoephedrine hydrochloride extended-release tablets
    Patent number: 5895663
    Abstract: Pseudoephedrine hydrochloride extended-release tablets including a sustained release hydroxypropylmethylcellulose matrix and a microcrystalline cellulose disintegrant formed by a dry mixed, direct compression method.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: April 20, 1999
    Assignee: L. Perrigo Company
    Inventors: Jack T. Irwin, Shirish A. Shah