Patents by Inventor Jerre G. Longfellow

Jerre G. Longfellow 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).

  • Optical liquid level sensor including built-in test circuitry
    Patent number: 5880480
    Abstract: A liquid sensing apparatus for a fuel tank comprises a first optical sensor for producing an output having a first state that corresponds to the first optical sensor being exposed to air and a second state that corresponds to the first optical sensor being exposed to fuel; and a circuit for detecting the first and second optical sensor output states. The sensor circuit also has self test capability for testing both active and passive components. The sensor circuits can be accessed using a two wire only interface, and thermal stability can be achieved with the electronic circuit as shown.
    Type: Grant
    Filed: March 13, 1997
    Date of Patent: March 9, 1999
    Assignee: Simmonds Precision Products, Inc.
    Inventors: Sylvester M. Ellinger, Ralph E. Burt, Jerre G. Longfellow, Robert D. LaClair