Child monitoring device

• US 4,899,135 A
• Filed: 12/05/1988
• Issued: 02/06/1990
• Est. Priority Date: 12/05/1988
• Status: Expired due to Fees

• Current Assignee: Mehdi Ghahariiran
• Original Assignee: Mehdi Ghahariiran
• Inventors: Ghahariiran, Mehdi
• Primary Examiner(s): Swann, III, Glen R.
• Assistant Examiner(s): Mullen, Jr., Thomas J.
• Application Number:
  US07/279,968
• Time in Patent Office: 428 Days
• Field of Search: 340/573, 340/539, 340/568, 340/687, 340/572, 340/574, 200/61.59
• US Class Current: 340/573.4
• CPC Class Codes: G08B 21/0227 System arrangements with a plurality of child units
• CPC Class Codes: G08B 21/24 Reminder alarms, e.g. anti-loss alarms

Abstract

An ultra-sonic or radio-frequency monitoring system comprising a transmitting unit carried by the child and a receiving unit carried by the child'"'"'s guardian that will alert the guardian when the child strays beyond a predescribed distance, is abducted or falls into water.

Claims

1. A range sensitive system employing two or more ultra sonic transceivers to monitor the activities of a child, children or individuals, carrying transceivers monitored by a base transceiver carried by a guardian wherein the improvement comprises:

a, the transceivers operating in ultra sonic frequency spectrum;

p1 b, the child'"'"'s transceiver transmitting a constant signal which is received by the guardian'"'"'s transceiver which converts the signal into an audio tone;

c, the guardian'"'"'s transceiver having a threshold receiving circuit adjustable to correlate a prescribed distance from the transceiver carried by the child;

d, the loss of a signal from the child'"'"'s transceiver energizing an audio generator in the guardian'"'"'s tranceiver;

e, a signal from the guardian'"'"'s transceiver energizing an audio tone transmitter in the child'"'"'s transceiver;

f, the child'"'"'s transceiver carried in a holster having means to open the transmission circuit if the transceiver is removed from the holster; and

,

g, the child'"'"'s transceiver in the holster being attached to the child by a support belt having means to open the transmission circuit if the belt is removed from the child.