Patents by Inventor E-San Tseng

E-San Tseng 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: 5638583
    Abstract: A paper clip consists of two elastic steel plates only, and each elastic steel plate has a connect member punched out of its upper portion, and an upper curved grip is formed therein after punching. The two connect members are bent inward and combined together by hooking their outer ends together, with lower ends of the two steel plates elastically and separably contacting with each other for gripping papers by pressing inward and then releasing the curved grips.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: June 17, 1997
    Inventor: E-San Tseng