Patents by Inventor Tung Hang Chum

Tung Hang Chum 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: 7175025
    Abstract: A convenience package for thin film products according to aspects of the present invention places a folded stack of thin film plastic bags inside a container to protect the bags during shipping, handling and dispensing. The container surrounds the plastic bags and includes an opening through which individual bags are retrieved. The plastic bags are attached to each other in such a manner that retrieval of a first bag through the opening in the container partially retrieves a second bag and leaves part of the second bag protruding through the opening. Attachments between bags within the container ensure that each bag is opened as it is retrieved through the opening.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: February 13, 2007
    Inventor: Tung Hang Chum
  • Patent number: 6716296
    Abstract: A manufacturing method for plastic bags recombines a layer of plastic to the outside surface of the bag to provide a portion of the outside surface with a lower melting point than the inside surface of the bag. The bags are arranged in stacks and heat is applied to bond the low melting point layer. A relatively weak bond is formed between adjacent outside bag surfaces while the bag inside surfaces remain free of each other. The weak bond is positioned along the median of the bag and near the bag opening. A second bag is drawn open by the bond during retrieval of a first bag. A flexible separation tab is arranged to maintain the separation between the inside surfaces of the open bag. The separation tab may also be made conspicuous to present an obvious retrieval point for the top bag in a hanging bag dispensing arrangement.
    Type: Grant
    Filed: August 13, 2001
    Date of Patent: April 6, 2004
    Inventor: Tung Hang Chum
  • Publication number: 20020185405
    Abstract: A manufacturing method for plastic bags recombines a layer of plastic to the outside surface of the bag to provide a portion of the outside surface with a lower melting point than the inside surface of the bag. The bags are arranged in stacks and heat is applied to bond the low melting point layer. A relatively weak bond is formed between adjacent outside bag surfaces while the bag inside surfaces remain free of each other. The weak bond is positioned along the median of the bag and near the bag opening. A second bag is drawn open by the bond during retrieval of a first bag. A flexible separation tab is arranged to maintain the separation between the inside surfaces of the open bag. The separation tab may also be made conspicuous to present an obvious retrieval point for the top bag in a hanging bag dispensing arrangement.
    Type: Application
    Filed: August 13, 2001
    Publication date: December 12, 2002
    Inventor: Tung Hang Chum