Patents by Inventor by Judith B. Piazza, executrix

by Judith B. Piazza, executrix 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).

  • New rotary valve
    Patent number: 3934937
    Abstract: A new rotary valve for metering solid slurries.
    Type: Grant
    Filed: September 27, 1971
    Date of Patent: January 27, 1976
    Assignee: Standard Oil Company
    Inventors: Liong S. Tee, Carlo Piazza, deceased, by Judith B. Piazza, executrix