Patents by Inventor David C. DeCava

David C. DeCava 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).

  • Apparatus for pumping and directing fluids for hematology testing
    Patent number: 5380491
    Abstract: An apparatus for hematology testing, which has a sensing unit defining a counting orifice for the flow of a blood sample through the counting orifice to analyze the blood sample, and a pump unit having three syringes. A first syringe is coupled in fluid communication with the sensing unit on the inlet side of the counting orifice for injecting a stream of blood sample through the counting orifice. A second syringe is coupled in fluid communication with the sensing chamber on the inlet side of the counting orifice for simultaneously injecting a sheath of fluid surrounding the sample stream on the inlet side of the counting orifice. And a third syringe is coupled to the sensing chamber on the outlet side of the counting orifice for aspirating a sheath of fluid from the sensing chamber surrounding the sample stream on the outlet side of the counting orifice.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: January 10, 1995
    Assignee: CDC Technologies, Inc.
    Inventors: Edward L. Carver, Jr., David C. DeCava
  • Method for determining the distribution of constituent subpopulations within a population of particles having overlapping subpopulations
    Patent number: 5349538
    Abstract: A method and apparatus for determining the parameters (i.e., proportion, mean, and standard deviation) of constituent subpopulations within a sample population of particles which contains overlapping populations. The invention includes the use of the EM algorithm, an iterative process which estimates the probability that a particle belongs to any given overlapping subpopulation.
    Type: Grant
    Filed: February 12, 1993
    Date of Patent: September 20, 1994
    Assignee: Edward Lawrence Carver, Jr.
    Inventors: Edward L. Carver, Jr., Richard D. DeVeaux, David C. DeCava
  • Method and apparatus for determining the distribution of constituent subpopulations within a population of particles having overlapping subpopulations
    Patent number: 5187673
    Abstract: A method and appartatus for determining the parameters (i.e., proportion, mean, and standard deviation) of constituent subpopulations within a sample population of particles which contains overlapping populations. The invention includes the use of the EM algorithm, an iterative process which estimates the probability that a particle belongs to any given overlapping subpopulation.
    Type: Grant
    Filed: February 5, 1991
    Date of Patent: February 16, 1993
    Assignee: Edward L. Carver, Jr.
    Inventors: Edward L. Carver, Jr., Richard D. DeVeaux, David C. DeCava