Patents by Inventor Calvin B. Chang

Calvin B. Chang 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).

  • Fusee cap having a spark deflector shield
    Patent number: 5917142
    Abstract: A fusee cap includes a fusee cap body having a scratch surface for frictional engagement with the head of a fusee to cause fusee ignition and a spark deflector shield projecting from the fusee cap body to deflect sparks produced during ignition.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: June 29, 1999
    Inventor: Calvin B. Chang