Patents by Inventor Kit-Shing Chu

Kit-Shing Chu 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).

  • Replaceable battery pack of rechargeable batteries
    Patent number: 5504412
    Abstract: The present invention is directed to a releasable battery pack containing rechargeable batteries. In particular, the present invention facilitates the easy collection and proper disposal of useless rechargeable batteries without discarding the electrical device in which the rechargeable batteries are installed. Further, the present invention is directed to a releasable, rechargeable battery pack which is not removed from the electrical device during charging of the battery pack. The present invention is also directed to a battery pack fitted to a wet and dry portable vacuum cleaner.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: April 2, 1996
    Assignee: GSL Rechargeable Products, Limited
    Inventors: Ka-Ming Chan, Kit-Shing Chu