Patents by Inventor David Ernest Smith

David Ernest Smith 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).

  • Powder composition for inhalation therapy
    Patent number: 4009280
    Abstract: A powder composition comprising a mixture of the di-sodium salt of 1,3-bis(2-carboxychromon-5-yloxy) propan-2-ol having a mass median diameter in the range of 2 to 4, preferably 2.5 to 3.5 microns and a solid carrier acceptable in the lungs and having a particle size in the range of from 30 to 150 microns.
    Type: Grant
    Filed: June 9, 1975
    Date of Patent: February 22, 1977
    Assignee: Fisons Limited
    Inventors: Donald Ross Macarthur, David Ernest Smith