Patents by Inventor Douglas H. Dayment

Douglas H. Dayment 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 level indicating apparatus
    Patent number: 4774838
    Abstract: Electrical apparatus for providing an indication of the level of the contents of a container comprises a temperature sensing unit, means for mounting, e.g. detachably, the temperature sensing unit against a container wall and visual and/or audible indicator means. The temperature sensing unit comprises a temperature sensing circuit including at least two spaced apart temperature sensors and an indicator circuit for energizing the indicator means. In use, energization of the indicator means occurs when the temperature sensors detect at least a minimum temperature difference.
    Type: Grant
    Filed: March 2, 1987
    Date of Patent: October 4, 1988
    Assignee: Adwel Industries Limited
    Inventors: Colin D. Rickson, Douglas H. Dayment, William V. Less