Patents by Inventor William Chung-Sum Chow

William Chung-Sum Chow 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).

  • Single and multi-point door lock
    Patent number: 8534099
    Abstract: In a lock drive train, the combination includes a pivoted lock bolt to be carried by a door, a casing, a rotary cylinder operatively rotatable during door opening or closing, a rack driven endwise in response to cylinder rotation, a gear rotatable by the driven rack, a pivoted lock dog driven by the gear, a bolt release lever, pivotable by the gear, between angular positions in which it is retained by the lock dog, the angular positions corresponding to extended and retracted positions of the bolt.
    Type: Grant
    Filed: July 1, 2010
    Date of Patent: September 17, 2013
    Assignee: Adams Rite Manufacturing Co.
    Inventors: Thomas J. Wheeler, William Chung-Sum Chow
  • Door top latching actuation
    Patent number: 8534719
    Abstract: Door top latch and actuating apparatus, comprising in combination, a mounting bracket configured to attach to a door top, a latch located by the bracket to move up and down, relative to the door top, an actuator rod extending vertically below the latch, and operatively connected to the latch whereby door handle operated vertical movement of the rod moves the latch vertically, and a compression spring associated with the rod for urging the rod and latch upwardly into latching position, the spring accommodating downward movement of the rod and latch, to unlatch the door, and a motion adaptor operatively connected between the rod and latch.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: September 17, 2013
    Assignee: Adams Rite Manufacturing Co.
    Inventor: William Chung-Sum Chow
  • Door top latching actuation
    Publication number: 20130062892
    Abstract: Door top latch and actuating apparatus, comprising in combination, a mounting bracket configured to attach to a door top, a latch located by the bracket to move up and down, relative to the door top, an actuator rod extending vertically below the latch, and operatively connected to the latch whereby door handle operated vertical movement of the rod moves the latch vertically, and a compression spring associated with the rod for urging the rod and latch upwardly into latching position, the spring accommodating downward movement of the rod and latch, to unlatch the door, and a motion adaptor operatively connected between the rod and latch.
    Type: Application
    Filed: September 9, 2011
    Publication date: March 14, 2013
    Inventor: William Chung-Sum Chow
  • Single and multi-point door lock
    Publication number: 20120000257
    Abstract: In a lock drive train, the combination includes a pivoted lock bolt to be carried by a door, a casing, a rotary cylinder operatively rotatable during door opening or closing, a rack driven endwise in response to cylinder rotation, a gear rotatable by the driven rack, a pivoted lock dog driven by the gear, a bolt release lever, pivotable by the gear, between angular positions in which it is retained by the lock dog, the angular positions corresponding to extended and retracted positions of the bolt.
    Type: Application
    Filed: July 1, 2010
    Publication date: January 5, 2012
    Inventors: Thomas J. Wheeler, William Chung-Sum Chow