US5841352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Child monitor
Assignee: Individual
•
Filing: 1997-06-18
•
Granted: 1998-11-24
•
Expires: 2017-06-18
Abstract
Abstract A monitor system comprises first and second watches for wear by first and second users of the system. Each watch includes a battery therein for powering a transmitter and receiver. A signal limiter provides a base signal to a comparator so that the comparator can compare the base signal to a transmitted signal from one watch as received by the receiver of the other watch. Upon the received signal being less than the base signal, the comparator closes a relay which in turn energizes an alarm. The alarm indicates that an undesired amount of separation has occurred between the two watches. The strength of the signal produced by the signal limiter can be varied such that the desired degree of separation between the watches, which energizes the alarm, can be varied. A panic button is provided so that an alarm in one watch can be energized by the user of another watch irrespective of the distance between watches. The use of the monitor system in a watch-type configuration allows for its unobtrusive use.
Inventors
- 👤 Sushil Prakash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:08
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/02; G08B21/0202; G08B21/0236; G08B21/0241; G08B21/0247
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
209 words
An alarm system comprising: first and second watches for wear by first and second users, each watch having a transceiver assembly comprising: transmitting means for sending a signal; means for providing a periodic sending of said signals by said transmitting means; receiver means for receiving said transmitted signals from the other watch; means for powering said transmitting and receiving means; signal producing means for producing a base signal indicative of a strength of a signal received by one watch if transmitted from the other watch at a preselected distance; comparator means for comparing a signal transmitted by the other watch and received by said receiving means to said base signal produced in said watch receiving said signal, said comparator means producing a comparator signal upon a strength of said received signal from the other watch being less than a strength of said produced base signal; a relay responsive to said produced comparator signal; alarm means connected to said relay, a closure of said relay in response to said comparator signal connecting said power means to said alarm means, whereby to energize said alarm means, said energized alarm means indicative of one of said watches receiving a signal transmitted from the other watch from a distance beyond said preselected distance.
Claim 2
Dependent Claim
209 words
An alarm system comprising: first and second watches for wear by first and second users, each watch having a transceiver assembly comprising: transmitting means for sending a signal; means for providing a periodic sending of said signals by said transmitting means; receiver means for receiving said transmitted signals from the other watch; means for powering said transmitting and receiving means; signal producing means for producing a base signal indicative of a strength of a signal received by one watch if transmitted from the other watch at a preselected distance; comparator means for comparing a signal transmitted by the other watch and received by said receiving means to said base signal produced in said watch receiving said signal, said comparator means producing a comparator signal upon a strength of said received signal from the other watch being less than a strength of said produced base signal; a relay responsive to said produced comparator signal; alarm means connected to said relay, a closure of said relay in response to said comparator signal connecting said power means to said alarm means, whereby to energize said alarm means, said energized alarm means indicative of one of said watches receiving a signal transmitted from the other watch from a distance beyond said preselected distance.
Claim 3
Dependent Claim
18 words
The device as claimed in claim 1 further comprising means for varying the strength of said base signal.
Claim 4
Dependent Claim
26 words
The device as claimed in claim 1 wherein said base signal decreases in value according to an increase in a said preselected distance of said watches.
Claim 5
Dependent Claim
29 words
The device as claimed in claim 1 further comprising means for reducing a strength of said received signal to less than said base signal, whereby to energize said alarm.
Claim 6
Dependent Claim
30 words
The device as claimed in claim 4 wherein said reducing means comprises a button on said watch to cease transmission of said signal, whereby said received signal strength is zero.
Claim 7
Dependent Claim
159 words
An alarm system comprising: first and second housing for carrying by first and second users, each housing having a transceiver assembly comprising: transmitting means for sending a signal; receiver means for receiving a transmitted signal from the other assembly; means for powering said transmitting and receiving means; signal producing means for producing a base signal indicative of a strength of a signal received by one assembly if transmitted from another housing at a preselected distance, said signal producing means including means for varying the strength of said base signal; comparator means for comparing a signal received by said receiving means to said base signal, said comparator means producing a comparator signal upon a strength of said received signal being less than a strength of said base signal; a relay responsive to said comparator signal; alarm means connected to said relay, a closure of said relay connecting said power means to said alarm means, whereby to energize said alarm means.
Claim 8
Dependent Claim
159 words
An alarm system comprising: first and second housing for carrying by first and second users, each housing having a transceiver assembly comprising: transmitting means for sending a signal; receiver means for receiving a transmitted signal from the other assembly; means for powering said transmitting and receiving means; signal producing means for producing a base signal indicative of a strength of a signal received by one assembly if transmitted from another housing at a preselected distance, said signal producing means including means for varying the strength of said base signal; comparator means for comparing a signal received by said receiving means to said base signal, said comparator means producing a comparator signal upon a strength of said received signal being less than a strength of said base signal; a relay responsive to said comparator signal; alarm means connected to said relay, a closure of said relay connecting said power means to said alarm means, whereby to energize said alarm means.
Claim 9
Dependent Claim
166 words
An alarm system comprising: first and second housings for transport by first and second users, each housing having a transceiver assembly comprising: transmitting means for sending a signal; receiver means for receiving a transmitted signal from the other housing; means for powering said transmitting and receiving means; signal producing means for producing a base signal indicative of a strength of a signal received by one housing if transmitted from another housing at a preselected distance; comparator means for comparing a signal received by said receiving means to said base signal, said comparator means producing a comparator signal upon a strength of said received signal being less than a strength of said base signal; a relay responsive to said comparator signal; a user-operable switch for closing said relay in the absence of said comparator signal; alarm means connected to said relay, a closure of said relay by said comparator signal or said switch connecting said power means to said alarm means, whereby to energize said alarm means.
Claim 10
Dependent Claim
166 words
An alarm system comprising: first and second housings for transport by first and second users, each housing having a transceiver assembly comprising: transmitting means for sending a signal; receiver means for receiving a transmitted signal from the other housing; means for powering said transmitting and receiving means; signal producing means for producing a base signal indicative of a strength of a signal received by one housing if transmitted from another housing at a preselected distance; comparator means for comparing a signal received by said receiving means to said base signal, said comparator means producing a comparator signal upon a strength of said received signal being less than a strength of said base signal; a relay responsive to said comparator signal; a user-operable switch for closing said relay in the absence of said comparator signal; alarm means connected to said relay, a closure of said relay by said comparator signal or said switch connecting said power means to said alarm means, whereby to energize said alarm means.
References Cited (Backward Citations)
US3922678A
Cited
US4785291A
Cited
US5021794A
Cited
US5170172A
Cited
US5343512A
Cited
US5515419A
Cited
US5311185A
Cited
US5289163A
Cited
US5461365A
Cited
US5589821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-11-23 | 2002-05-25 | 2002-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-23 | 2006-05-25 | 2006-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-23 | 2010-05-25 | 2010-11-24 | $7700.00 | Window Closed / Lapsed |