Patents by Inventor Liberato Rizzi

Liberato Rizzi 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).

  • Piezoceramic elevator vibration attenuator
    Patent number: 6364064
    Abstract: An apparatus for actively controlling transmission of vibration energy to a movable platform, such as an elevator floor, attached to a carriage for transporting the movable platform. The apparatus includes a passive vibration attenuator for passively absorbing vibration energy transmitted through the carriage. Also included is a vibration sensor having a first piezoelectric material and connected in series with the passive vibration attenuator. The vibration sensor is configured to generate an electrical signal in response to deformation of the vibration sensor caused by vibration energy transmitted through the passive vibration attenuator. An inverter for inverting the electrical signal from the vibration sensor and outputting an inverted electrical signal that is equal in magnitude and opposite in polarity to the electrical signal from the vibration sensor.
    Type: Grant
    Filed: March 8, 2000
    Date of Patent: April 2, 2002
    Assignee: Inventio AG
    Inventor: Liberato Rizzi