Patents by Inventor Loren B. Ferris

Loren B. Ferris 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).

  • Power recovery system and method for elevator apparatus
    Patent number: 4489812
    Abstract: Disclosed is a system and method for recovering energy from elevator apparatus and utilizing the recovered energy for useful purposes. This is accomplished by selectively coupling a hydraulic pump to the elevator drive when surplus energy is available thereby to pump and store pressurized fluid in accumulator devices. Such fluid, when above a predetermined pressure, is utilized to deactivate electrically driven units and drive the same by hydraulic motors supplied with fluid from the accumulator devices. Additional energy is recovered from heat present in the hydraulic fluid downstream from the hydraulic pump and utilized beneficially.
    Type: Grant
    Filed: July 22, 1983
    Date of Patent: December 25, 1984
    Inventor: Loren B. Ferris
  • Elevator with power recovery
    Patent number: RE32404
    Abstract: Disclosed is a system and method for recovering energy from elevator apparatus and utilizing the recovered energy for useful purposes. This is accomplished by selectively coupling a hydraulic pump to the elevator drive when surplus energy is available thereby to pump and store pressurized fluid in accumulator devices. Such fluid, when above a predetermined pressure, is utilized to deactivate electrically driven units and drive the same by hydraulic motors supplied with fluid from the accumulator devices. Additional energy is recovered from heat present in the hydraulic fluid down-stream from the hydraulic pump and utilized beneficially.
    Type: Grant
    Filed: March 20, 1985
    Date of Patent: April 21, 1987
    Inventor: Loren B. Ferris