Patents by Inventor George Albert Merritt, Jr.

George Albert Merritt, Jr. 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: 4075434
    Abstract: Privacy by way of excluding all other key set talking circuits (T-R) from the seized line in a standard key set or conference key set system is obtained by providing a privacy exclusion circuit at each key set in the system. The exclusion circuit at the key set which seizes a particular T-R line first causes the voltage on the A lead associated with that line to drop below a certain critical value, thereby causing all the other exclusion circuits in all the other key sets to open their respective talking circuits if an attempt is made to access the occupied line. In order to permit other key sets to access the occupied line, the key set first to seize the line can, without relinquishing the line, permit the voltage on the respective A lead to rise above the critical value, permitting another key set access. Upon such access occurring by the other key set all other key sets are again excluded because the voltage on that particular A lead again drops below the critical value.
    Type: Grant
    Filed: March 25, 1976
    Date of Patent: February 21, 1978
    Assignee: San/Bar Corporation
    Inventor: George Albert Merritt, Jr.