Patents by Inventor John K. Bertoldi

John K. Bertoldi 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).

  • Monolaminar piezoelectric bender bar
    Patent number: 5001681
    Abstract: A single stack of double poled piezoelectric ceramic elements (202) create a monolaminar bender bar (200) which can be used in acoustic applications. The stack is lined up such that adjacent elements (202) in bender bar (200) have oppositely poled top and bottom sections. A positive voltage (230) is connected to electrical connection plates (214) which are positioned between every other piezoelectric element (202) in the stack and a negative voltage (232) is connected to electrical connection plates (214) which are between the remaining piezoelectric elements (202). Applying a voltage causes the stack to bend, wherein the piezoelectric elements (202) in the top half of the bender bar (200) all expand while the piezoelectric elements (202) in the bottom half of the bender bar (200) all contract.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: March 19, 1991
    Assignee: Honeywell Inc.
    Inventors: John K. Bertoldi, Manuel A. Gonzalez