Patents by Inventor David C. K. Kwan

David C. K. Kwan 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).

  • Patent number: 5528014
    Abstract: A toy oven has a heating compartment accessible through an aperture in a front wall of a housing of the oven. A door is provided which is manually movable to close off the aperture. IN one embodiment, the door is slidably mounted and in another embodiment it is pivotally mounted. A mechanical interlock engages the door to prevent it from opening if the electrical power switch is on. Another mechanical interlock prevents the door from opening when the heating compartment is at a high temperature. The oven is thus safe to use by children in normal play. A fan may be provided to cool the heating compartment when the power switch is turned off and is thereafter automatically turned off after a predetermined time or when the temperature in the heating compartment falls to a safe level. A timer may also be provided to automatically switch power off after a predetermined time of inactivity.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: June 18, 1996
    Inventors: Harvey Goldberg, David C. K. Kwan, Steven Lebensfeld
  • Patent number: 5451745
    Abstract: A toy oven has a heating compartment accessible through an aperture in a front wall of a housing of the oven. A door is provided which is manually movable to close off the aperture. IN one embodiment, the door is slidably mounted and in another embodiment it is pivotally mounted. A mechanical interlock engages the door to prevent it from opening if the electrical power switch is on. Another mechanical interlock prevents the door from opening when the heating compartment is at a high temperature. The oven is thus safe to use by children in normal play. A fan may be provided to cool the heating compartment when the power switch is turned off and is thereafter automatically turned off after a predetermined time or when the temperature in the heating compartment falls to a safe level. A timer may also be provided to automatically switch power off after a predetermined time of inactivity.
    Type: Grant
    Filed: August 24, 1993
    Date of Patent: September 19, 1995
    Inventors: Harvey Goldberg, David C. K. Kwan, Steven Lebensfeld
  • Patent number: 5147237
    Abstract: A toy audio generating device is disclosed for use as an accessory to another toy, for example as a backpack for a toy action figure. The toy audio device includes a receptacle defining an enclosure containing a speaker and plural batteries laid out side-by-side adjacent the end of the speaker opposite the sound projecting portion of the speaker. A printed circuit board containing circuitry for generating audio signals is located in a space alongside the speaker under a side wall of the enclosure. A switch for activating sound generation is mounted to that side wall and directly contacts the printed circuit board.
    Type: Grant
    Filed: December 11, 1991
    Date of Patent: September 15, 1992
    Assignee: Toymax Inc.
    Inventors: David C. K. Kwan, Ma H. Wai, Steven Lebensfeld, Harvey Goldberg
  • Patent number: 5092810
    Abstract: A toy audio generating device is disclosed for use as an accessory to another toy, for example as a backpack for a toy action figure. The toy audio device comprises a receptacle defining an enclosure containing a speaker and plural batteries laid out side-by-side adjacent the end of the speaker opposite the sound projecting portion of the speaker. A printed circuit board containing circuitry for generating audio signals is located in a space alongside the speaker under a side wall of the enclosure. A switch for activating sound generation is mounted to that side wall and directly contacts the printed circuit board.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: March 3, 1992
    Assignees: Steven Lebensfeld, Harvey Goldberg, David C. K. Kwan
    Inventors: David C. K. Kwan, Ma H. Wai, Steven Lebensfeld, Harvey Goldberg
  • Patent number: 5073140
    Abstract: Toy action figures and detachable accessories therefor incorporating audio generating apparatus are disclosed. The audio generating apparatus is entirely contained within the accessory and generates both speed and sound effects. The detachable accessories have a configuration and visual appearance coordinated with the configuration and visual appearance of the toy action figure. For example, the accessory may be a backpack configured and having a visual appearance to coordinate with a soldier, spaceman or policeman action figure. The audio generating apparatus includes separate controls for causing the audio generating apparatus to independently generate speech and sound effects. The accessories in configuration, appearance and sound content are made to be attachable and applicable to different types of action figures.
    Type: Grant
    Filed: October 22, 1990
    Date of Patent: December 17, 1991
    Assignees: Steven Lebensfeld, Harvey Goldberg, David C. K. Kwan, Ma H. Wai
    Inventors: Steven Lebensfeld, Harvey Goldberg, David C. K. Kwan, Ma H. Wai