Patents by Inventor Thomas D. Culhane

Thomas D. Culhane 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).

  • Household alarm system
    Patent number: 4996517
    Abstract: An alarm system providing external alarm signals for a structure. The alarm system includes transmitters for generating coded radio trigger signals. An alarm controller located in the interior of the structure is responsive to the coded radio trigger signals for generating alarm actuation signals. The alarm actuation signals are transmitted to alarm signal generators located on the exterior of the structure. Transmission lines for the alarm actuation signals are connected between the alarm controller and the alarm signals generators. Integrity determination of the transmission lines is provided by detection of a break in a current loop provided by a ground line and a ground sense line connected between the controller and the alarm signal generators along side the transmission lines.
    Type: Grant
    Filed: April 6, 1989
    Date of Patent: February 26, 1991
    Assignee: Assist, Inc.
    Inventors: Dale E. Kringen, Thomas D. Culhane