Patents by Inventor Vencent Chen

Vencent 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).

  • Wallet capable of preventing loss of cards kept therein
    Patent number: 5914657
    Abstract: A wallet having a plurality of card slots for holding the credit cards, the charge cards, etc. The card slots are provided with a sensing circuit, an IC circuit board connected in series with a buzzer and a photo sensor. The buzzer is not activated when a card is removed from one of the card slots. The buzzer is activated when the card is not returned to the card slot and when the wallet remains unfolded such that the photo sensor is exposed to light.
    Type: Grant
    Filed: June 26, 1998
    Date of Patent: June 22, 1999
    Inventor: Vencent Chen