Patents by Inventor David C. H. Leung

David C. H. Leung 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).

  • Clock
    Patent number: D305620
    Type: Grant
    Filed: October 10, 1986
    Date of Patent: January 23, 1990
    Assignee: Langfield Electronics Co., Inc.
    Inventor: David C. H. Leung
  • Clock
    Patent number: D306143
    Type: Grant
    Filed: May 23, 1986
    Date of Patent: February 20, 1990
    Assignee: Langfield Electronics Co., Ltd.
    Inventor: David C. H. Leung