Patents by Inventor Juurong Hsieh

Juurong Hsieh 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).

  • Device for disabling power under certain safety conditions
    Patent number: 4172980
    Abstract: Electrical systems (20), such as an electric propulsion system for a vehicle (100) for example, often have electric power available for components of the system (20) when non-operating conditions occur, such as turning off the vehicle key switch (38). An electronic control circuit (10) is provided for controllably interrupting power flow to the system (20) and disabling the system (20) in response to any of a plurality of non-operating conditions.The electronic control circuit (10) includes a transistor (26) having a base (30), an emitter (28), and a collector (32) and being energized to an on condition in response to the base (30) receiving a preselected signal. The signal is controllably delivered to the base (30) in response to a first switch (38) being open and is controllably delivered to the base (30) a preselected time after a second switch (68) is opened.
    Type: Grant
    Filed: June 30, 1978
    Date of Patent: October 30, 1979
    Assignee: Towmotor Corporation
    Inventors: Juurong Hsieh, Grant C. Melocik