Patents by Inventor Andrew J. Donofrio

Andrew J. Donofrio 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).

  • Elevator cab load measuring system
    Patent number: 4330836
    Abstract: Transducers are located between the elevator cab and the supporting frame at points which lie along a line that passes through the cab center of deflection. These transducers produce an analog output whose magnitude varies proportionally with the force applied through the transducer to the cab. The outputs of the transducers are summed together and their actual sum corresponding to the empty car condition is subtracted from the sum of the outputs and the remainder is multiplied by the actual ratio between car weight and the sum of the transducer outputs. This yields the cab load.
    Type: Grant
    Filed: November 28, 1979
    Date of Patent: May 18, 1982
    Assignee: Otis Elevator Company
    Inventors: Andrew J. Donofrio, John E. Gaines