Patents by Inventor Marwan E. Hattem

Marwan E. Hattem 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).

  • Collapsible revolving door
    Patent number: 4688350
    Abstract: A revolving door (10) adapted to be mounted in a doorway to provide access and egress. The door (10) revolves about a vertical axis and has an upper cam housing (20) and a lower cam housing (22). Radial slots (24) extend through cam housings (20, 22). Pins (26) engage slots (24) and secure doorwings (12) to upper and lower cam housings (20, 22). A mechanism is mounted within at least one of cam housings (20, 22) for permitting doorwings (12) to be collapsed in panic situations or to accommodate large objects. At least one of the upper and lower cam housings has lateral bores (34) extending therethrough and intersecting the radial slots (24) at right angles. The mechanism for permitting the cam housings to be collapsed includes a cam mounted on each pin securing the doorwing to the cam housing and a spring-biased detent mechanism mounted within the lateral bore.
    Type: Grant
    Filed: July 29, 1986
    Date of Patent: August 25, 1987
    Assignee: Tubelite Division of Indall, Inc.
    Inventors: Marwan E. Hattem, Calvin R. Rushford