Patents by Inventor Derrick C. Dobson

Derrick C. Dobson 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).

  • Method of analysis
    Patent number: 4204838
    Abstract: Method for detecting the presence of a substance contained in a fluid medium, which medium also contains particulate matter therein, comprising the addition of at least a portion of the fluid medium to a leaf material capable of separating by diffusion the fluid medium from the particulate matter and examination, using instrumental detection means, for the presence of the substance contained in the fluid medium in a detection area on the leaf material to which the fluid medium has diffused away from the particulate matter. Apparatus for performing the method where the fluid is a liquid is also described.
    Type: Grant
    Filed: June 1, 1978
    Date of Patent: May 27, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: John H. Atherton, Derrick C. Dobson, Ian Hodgkinson, John R. P. Clarke