Patents by Inventor Joseph Vignolo

Joseph Vignolo 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).

  • Digital panel meter
    Patent number: 4853619
    Abstract: A digital panel meter adapted for replacement of a standard analog panel meter and designed to selectively receive different ranges of input signals such as AC or DC input signals. The meter circuitry employs an analog-to-digital converter having multiple digits, an input circuit including a range circuit, an operational amplifier and filter circuitry. A relay is tripped for signaling the attaining of a trip point. An audible alarm is provided that may be enabled or disabled and that may be operated in either continuous or short term modes.
    Type: Grant
    Filed: February 17, 1988
    Date of Patent: August 1, 1989
    Assignee: R. T. Engineering Service, Inc.
    Inventors: Brian Paulsen, Joseph Vignolo