Patents by Inventor John E. F. Holley

John E. F. Holley 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 detecting the presence of micro organism in liquid
    Patent number: 4863868
    Abstract: An analyzer for detecting and measuring microorganisms in liquids comprising a probe with an orifice adapted to have liquid containing particles passed through it, and a means for passing cleansing liquid over the orifice is disclosed.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: September 5, 1989
    Assignee: Prolitec Aktiengesellschaft
    Inventor: John E. F. Holley
  • Particle counter with variable sized aperture
    Patent number: 4853618
    Abstract: In a particle counter of the Coulter Counter type the orifice size can be varied by the insertion of an insert into the orifice. This enables particles of a wide ranged of sizes to be effectively detected.
    Type: Grant
    Filed: March 16, 1987
    Date of Patent: August 1, 1989
    Inventor: John E. F. Holley