Patents by Inventor Richard D. Vannest

Richard D. Vannest 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).

  • Patent number: 4207394
    Abstract: Microorganisms in a specimen are detected, identified, and enumerated by introducing the specimen into a sampling cartridge and diluting the specimen with a known volume of water within the cartridge. The cartridge has a manifold and several cassettes attached to the manifold. Each cassette contains a serpentine flow channel having a series of filters therein and a detection cell located downstream from each filter. The flow channel in each cassette also contains a culture medium which is freeze dried and is highly selective in the sense that it promotes the growth of one type of microorganism, but not others. The mixture of the specimen and water flows from the manifold into the flow channel of each cassette where it rehydrates the culture medium therein and further flows through the filters. Each filter removes a known proportion of the microorganisms from the mixture of specimen, water and medium, thereby effecting a serial dilution.
    Type: Grant
    Filed: November 25, 1977
    Date of Patent: June 10, 1980
    Assignee: McDonnell Douglas Corporation
    Inventors: Clifton Aldridge, Jr., Paul W. Jones, Sandra F. Gibson, Richard D. Vannest, James T. Holen, George F. Keyser, Michael C. Meyer
  • Patent number: 4173515
    Abstract: A broth medium for the detection of Group D enterococci in urine. The medium employs neomycin sulfate to inhibit growth of Staphylococcus aureus, potassium tellurite to inhibit growth of gram-negative organisms, and ferric ammonium citrate and esculin hydrolysate indicators.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: November 6, 1979
    Assignee: McDonnell Douglas Corporation
    Inventors: Clifton Aldridge, Sandra F. Gibson, Richard D. Vannest, Gregory D. Rodgers
  • Patent number: 3963355
    Abstract: Microorganisms in a specimen are detected, identified, and enumerated by introducing the specimen into a sampling cartridge and diluting the specimen with a known volume of water within the cartridge. The cartridge has a manifold and several cassettes attached to the manifold. Each cassette contains a serpentine flow channel having a series of filters therein and a detection cell located downstream from each filter. The flow channel in each cassette also contains a culture medium which is freeze dried and is highly selective in the sense that it promotes the growth of one type of microorganism, but not others. The mixture of the specimen and water flows from the manifold into the flow channel of each cassette where it rehydrates the culture medium therein and further flows through the filters. Each filter removes a known proportion of the microorganisms from the mixture of specimen, water and medium, thereby effecting a serial dilution.
    Type: Grant
    Filed: April 16, 1974
    Date of Patent: June 15, 1976
    Assignee: McDonnell Douglas Corporation
    Inventors: Clifton Aldridge, Jr., Paul W. Jones, Sandra F. Gibson, Richard D. Vannest, James T. Holen, George F. Keyser, Michael C. Meyer