Patents by Inventor Berry M. Grant

Berry M. Grant 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).

  • Method and apparatus for protecting a cylinder of an hydraulic elevator
    Patent number: 5076146
    Abstract: Fluid is detected within a protective encasement of an hydraulic cylinder of an elevator by applying a low pressure to the interior of the encasement and sensing for the presence of fluid as a result of the application of the low pressure. If fluid is detected, a greater pressure is applied within the protective encasement to eliminate the detected fluid. The protective encasement, which may be pressurized, has a pressure input port, an evacuation port, and an evacuation tube which attaches to the fluid evacuation port and extends to a region within the encasement below the bottom of the cylinder.
    Type: Grant
    Filed: July 18, 1990
    Date of Patent: December 31, 1991
    Assignee: Otis Elevator Company
    Inventors: Louis Bialy, Berry M. Grant, John T. Pitts, Sib S. Ray