Patents by Inventor Janet Elizabeth Williams

Janet Elizabeth Williams 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: 7310902
    Abstract: A personal safety device (10) includes at least one housing containing a quantity of a marking substance (30), an explosive charge (36), and a triggering apparatus (22) which is operative to detonate the explosive charge (36) to propel the marking substance from the housing (H) to mark the area surrounding the device.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: December 25, 2007
    Inventor: Janet Elizabeth Williams