Patents by Inventor David Chien Hua Chen

David Chien Hua Chen 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: 5848907
    Abstract: An adapter with interchangeable plug board (3) that can be easily interchanged for various types of receptacles is provided. The adapter includes a casing (1), a cover (2), and a plug board (3). The casing (1) is formed with first insetting means such as a plurality of slots (13, 14b, 14c). In addition, an upright slide slot (16) is formed on one sidewall of the casing (1). A sliding piece (17) is slidably inset in the slide slot (16). The sliding piece (17) is formed with a stop tongue (170) on the top and is lockable at least at a top position and a lower position. The plug board (3) has a base board (30) and a plurality of plug pins (31) erected thereon. Further, the base board (30) is formed with second insetting means such as a plurality of tongues (33, 34) for forming a tongue-and-slot joint with the first insetting means on the casing (1). A stop slot (35) is formed near the rear edge of the base board (30).
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: December 15, 1998
    Assignee: Board-Tech Electronic Co., Ltd.
    Inventor: David Chien Hua Chen
  • Patent number: 5836777
    Abstract: An electrical outlet device includes a base casing; a cover covering the base casing; a grounding conductive assembled including a base frame formed with at least a first clamping portion having a pair of elastic pieces, a second clamping portion having a pair of elastic pieces, and a third clamping portion having a pair of elastic pieces thereon; and a first contact conductive assembly and a second contact conductive assembly, each including a rib-like clamping portion composed of a pair of elastic pieces and a screen elastic piece. In this electrical outlet device, the elastic pieces of the first and third clamping portions of the grounding conductive assembly each have a top edge formed with a notch; and the elastic pieces of the rib-like clamping portion on the first and second contact conductive assemblies each has a top edge formed with a notch, the screen elastic piece being bent away from the rib-like clamping portion.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: November 17, 1998
    Assignee: Board-Tech Electronic Co., Ltd.
    Inventor: David Chien Hua Chen
  • Patent number: D381958
    Type: Grant
    Filed: August 22, 1995
    Date of Patent: August 5, 1997
    Inventor: David Chien Hua Chen