Patents by Inventor Derrick Wei Du

Derrick Wei Du 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).

  • Foldable and intrinsically safe plate capacitive sensors for sensing depth of solids in liquids and sensing depth of two different types of liquids in hazardous locations
    Patent number: 11474066
    Abstract: The present invention comprises a novel foldable and intrinsically safe plate capacitive sensor to measure liquid depths, solids in liquid depths, and two different liquids depths. This invention is used in onsite wastewater management systems (OWTS) to monitor depths of solids, oil, and effluent in a wastewater tank. The plates are configured to allow for solids, liquids and gases to surround the plates. A number of plates are hung in series from near the OWTS tank lid to at least 18 inches below the output baffle to measure the different materials at different depths in the OWTS tank. The capacitive sensors are capable of use with various materials to measure solids, oil, and effluent depths in an OWTS tank.
    Type: Grant
    Filed: April 29, 2020
    Date of Patent: October 18, 2022
    Inventor: Derrick Wei Du
  • Foldable and intrinsically safe plate capacitive sensors for sensing depth of solids in liquids and sensing depth of two different types of liquids in hazardous locations
    Publication number: 20210131992
    Abstract: The present invention comprises a novel foldable and intrinsically safe plate capacitive sensor to measure liquid depths, solids in liquid depths, and two different liquids depths. This invention is used in onsite wastewater management systems (OWTS) to monitor depths of solids, oil, and effluent in a wastewater tank. The plates are configured to allow for solids, liquids and gases to surround the plates. A number of plates are hung in series from near the OWTS tank lid to at least 18 inches below the output baffle to measure the different materials at different depths in the OWTS tank. The capacitive sensors are capable of use with various materials to measure solids, oil, and effluent depths in an OWTS tank.
    Type: Application
    Filed: April 29, 2020
    Publication date: May 6, 2021
    Inventor: Derrick Wei Du