Patents by Inventor Rolf Engstrom

Rolf Engstrom 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).

  • Security sensing module envelope
    Publication number: 20070271544
    Abstract: A circuit module for user data entry is provided with a cover in electrical communication with the circuit module. The cover has a plurality of circuit elements and circuit traces which result in particular electrical characteristics sensed by the circuit module.
    Type: Application
    Filed: May 19, 2006
    Publication date: November 22, 2007
    Inventor: Rolf Engstrom