Patents by Inventor Stewart G. Hamilton

Stewart G. Hamilton 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).

  • Blasting method with above and below surface delays
    Patent number: 4777880
    Abstract: A method of detonating explosive charges for the breaking of rock and ore comprises the use of two sets of components, one set within the explosive charge and the other set at the surface of the explosive. The set within the exposive comprises a detonator, a first delay element and a passive energy storage device such as a capacitor. The second set which is able to communicate with the first comprises a power source, a second delay element and a means for receiving signals from a remote command source. In a preferred embodiment, the first delay element has a fixed delay and the second delay element has a programmable delay.The method permits of versatility and precision in the use of explosives, using relatively inexpensive components.
    Type: Grant
    Filed: April 6, 1987
    Date of Patent: October 18, 1988
    Assignee: ICI Australia Limited
    Inventors: Timothy A. Beattie, Stewart G. Hamilton, Mark A. Irving, Barry K. Miskin