Patents by Inventor Tsung-An Wong

Tsung-An Wong 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: 5257859
    Abstract: An apparatus for keeping a stack of catalogue cards in neat order to be used, for example, in a library. If necessary, a librarian can replace a damaged catalogue card with a new one by just pressing a button at the bottom of the drawer to enable a compression spring to eject the metal rod passing through a stack of catalogue cards. Consequently, the librarian can freely rearrange the catalogue cards.
    Type: Grant
    Filed: November 14, 1991
    Date of Patent: November 2, 1993
    Assignee: Kewa Office & Library Products Co., Ltd.
    Inventor: Tsung-An Wong