Patents by Inventor David J. Mason

David J. Mason 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).

  • Liquid applicator
    Patent number: 4740799
    Abstract: Electrostatic spraying of a liquid from an applicator on to a substrate. Of primary importance for spraying ink from hand-held devices or in computer graphic work. The spraying is controlled by variation of a control electrode between an operative and an inoperative state; the control electrode, e.g. a needle, being positioned so as to affect the electrostatic field when activated and prevent spraying.
    Type: Grant
    Filed: March 7, 1986
    Date of Patent: April 26, 1988
    Assignee: Imperial Chemical Industries PLC
    Inventors: David J. Mason, Brian J. Stanier