Patents by Inventor Ashtyn Hereward Smith

Ashtyn Hereward Smith 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).

  • Protective systems
    Patent number: 3962696
    Abstract: A monitoring system for use as an intruder alarm comprises a sensor loop including at least one set of normally-closed contacts. An integrator circuit is coupled to the sensor loop and provides an alarm signal to an alarm when a set of contacts has been actuated for a predetermined period.
    Type: Grant
    Filed: June 14, 1973
    Date of Patent: June 8, 1976
    Assignee: Inertia Switch Limited
    Inventors: Ashtyn Hereward Smith, John Egon Forbat