Patents by Inventor David C. Richmond

David C. Richmond 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).

  • Patent number: 5001927
    Abstract: A liquid sensing assembly (10) senses the level of liquid (18) in a container (12). The assembly (10) includes a reference sensing capacitor (16) for sensing the dielectric constant of the liquid and a level sensing capacitor (14) for sensing the level of the liquid with a dielectric factor. A housing (20) forms one plate of the capacitors (14, 16), and two separate coiled wires form the second plates of the capacitors (14, 16). The capacitors (14, 16) are located within the housing (20) and separated by a seal (46) to prevent liquid from passing therethrough. The reference capacitor (16) is located in the upper end (28) of the housing (20) and receives the liquid directly at an inlet (52) and fills to overflow at an outlet (56) into the container (12). The level capacitor (16) is in the lower section of the housing (20) to sense the level in the container (12).
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: March 26, 1991
    Assignee: Teleflex Incorporated
    Inventors: James E. LaCava, David C. Richmond, Norman S. Martucci, Peter A. Hochstein