Patents by Inventor Leon Hoefsloot

Leon Hoefsloot 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).

  • Joint between a landing door and wall structures
    Patent number: 5560165
    Abstract: The invention relates to a system for joining the frame of a landing door (7) of an elevator to the wall structure (4) surrounding the frame, in such a way that the elevator shaft (5) is isolated from the rest of the space in the building. According to the invention, a heat-resistant protective element (9) flexible in normal temperature and at least in a temperature of 500.degree. is fitted between the frame (8) and the wall structure (4), said element being attached to the door frame (8) and to the shaft wall structure (4).
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: October 1, 1996
    Assignee: KONE Oy
    Inventors: Leon Hoefsloot, Ari Ketonen
  • Fire door for an elevator
    Patent number: 5404969
    Abstract: Fire door for an elevator, especially for use in the landing doorways of an elevator shaft. The fire door is mounted abreast of an elevator landing door. The fire protection characteristics of the fire door are so chosen that the elevator door and the fire door together fulfil the requirements imposed on a fire door.
    Type: Grant
    Filed: June 1, 1993
    Date of Patent: April 11, 1995
    Assignee: Kone Elevator GmbH
    Inventor: Leon Hoefsloot