Patents by Inventor Donald R. Hirschfeld

Donald R. Hirschfeld 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).

  • Cationic lipids for gene therapy
    Patent number: 6034137
    Abstract: This invention provides novel cationic lipids, particularly guanidino lipids, and methods for their preparation. Also provided are polyanionic-lipid complexes comprising the lipids of the invention, their preparation and use to deliver biologically active substances, particularly nucleic acids to cells.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: March 7, 2000
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Paula N. Belloni, Donald R. Hirschfeld, John O. Link, John J. Nestor, Jr., Gary A. Peltz
  • Substituted N-alkyl imidazoles to treat convulsions
    Patent number: 4568678
    Abstract: This invention relates to compounds of the formula: ##STR1## wherein A is biphenyl unsubstituted or substituted on one or both rings with one or more halo, lower alkyl, lower alkoxy or trifluoromethyl substituents; Z is ethylene unsubstituted or substituted with a single lower alkyl substituent or propylene unsubstituted or substituted with one or two lower alkyl substituents; and the pharmaceutically acceptable acid addition salts thereof. These compounds have anticonvulsant activity.
    Type: Grant
    Filed: June 11, 1984
    Date of Patent: February 4, 1986
    Assignee: Syntex (U.S.A.) Inc.
    Inventor: Donald R. Hirschfeld