Patents by Inventor Jan van Duijn

Jan van Duijn 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 assisting the visual assessment of test objects having multivariate visible characteristics, and its use
    Patent number: 4563096
    Abstract: Apparatus for use in and for assisting the visual assessment by a human operator of test objects, in each of which test objects a multiplicity of test locations each has one or more visible characteristics capable of exhibiting any one of a number of conditions to be assessed (e.g. a prepared microtiter plate or tray having an array of test locations or wells in which a series of microbial cultures or biological or chemical tests has been carried out leading to results to be optically or visually assessed, e.g.
    Type: Grant
    Filed: January 8, 1982
    Date of Patent: January 7, 1986
    Assignee: Internationale Octrooi Maatschappij "Octropa" B.V.
    Inventors: John W. Chidlow, Jan Van Duijn, Jan Siebesma
  • Disposable pump for dispensing small metered amounts of liquid from a container and a control unit for operating said pump
    Patent number: 4364718
    Abstract: A disposable pump of plastics material for dispensing small metered amounts of liquid from a single opening container to which it has been attached and which can be closed thereby, comprises a one piece housing and a cylindrical piston; the housing has gas inlet means for allowing gas to enter the container if any subatmospheric pressure should occur therein. A control unit for operating this pump comprises a programme for imparting a certain succession of rotative and sliding movements to the piston of said pump.
    Type: Grant
    Filed: February 24, 1981
    Date of Patent: December 21, 1982
    Assignee: Internationale Octrooi Maatschappij "Octropa" BV
    Inventors: Jacobus H. Beun, Jan van Duijn