H - Electricity – 04 – M
Patent
H - Electricity
04
M
344/22
H04M 3/38 (2006.01)
Patent
CA 1161533
TELEPHONE CALL RESTRICTING APPARATUS ABSTRACT OF THE DISCLOSURE An apparatus for restricting telephone calls placed onto a telephone line by a telephone set, wherein an off-hook condition begins operation of the apparatus and energizes a control circuit which provides a condition in which a call can be placed onto the telephone line. A disabling circuit responds to the control circuit and establishes a disabling condition on the telephone line which defeats a telephone call when it is of a restricted type. In one embodiment, the off-hook condition starts a time delay at the end of which a prede- termined frequency is placed onto the line. The occurrence of this frequency signal onto the telephone line disconnects all long distance telephone calls beyond a specified local zone. In a second embodiment, each number entered onto the telephone line is counted, and when a predetermined count is reached the disabling circuit is operated to prevent further calling. In a third embodiment, the telephone remains dis- abled after being placed in an off-hook condition, and all calling is prevented. However at predetermined intervals, the telephone is enabled so that during each interval a respective number can be called. The apparatus can include an override circuit for use by special preselected individuals for over- riding the disabling condition thereby permitting such special individuals to avoid the restrictions of the telephone calls.
370432
Marks & Clerk
Waldman Herbert H.
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