1
Hoyt M Layson Jr: Portable tracking apparatus for continuous position determination of criminal offenders and victims. Pro Tech Monitoring, Herbert W Larson, Larson & Larson P A, March 24, 1998: US05731757 (367 worldwide citation)

A portable locator or tracking apparatus is provided for continuous location determination of subjects which communicates with a body-worn, non-removable, tamper resistant transceiver and a central data-base system. The portable tracking apparatus has a Global Position System (GPS) receiver and iner ...


2
Hoyt M Layson Jr: Body worn active and passive tracking device. Pro Tech Monitoring, James E Larson, Larson & Larson P A, January 11, 2000: US06014080 (199 worldwide citation)

Tamper resistant body-worn tracking device to be worn by offenders or potential victims for use in a wireless communication system receiving signals from a global positioning system (GPS). The tracking device directly communicates spacial coordinates to multiple remote sites. The tracking device is ...


3
Hoyt M Layson Jr: Offender and victim collision avoidance and advanced warning system. Pro Tech Monitoring, James E Larson, Larson & Larson P A, November 9, 1999: US05982281 (146 worldwide citation)

A redundant system is provided for simultaneously notifying a victim about the approach of an offender when a message is sent to a central data base. The system includes multiple communication paths and assured message delivery. The offender's portable tracking apparatus is equipped with a memory ca ...


4
Hoyt M Layson Jr, David S Segal, Peter Lefferson: Tamper detection for body worn transmitter. Pro Tech Monitoring, James E Larson, Larson & Larson P A, September 28, 1999: US05959533 (72 worldwide citation)

A body worn transmitter and its associated portable monitoring receiver receiving global position signals, is provided with tamper detection to support twenty-four hour violation reporting from a subject under community supervision moves about the community. The body worn transmitter incorporates ac ...


5
J Chris Defant, David Segal, Steve Chapin: System, method and apparatus for charging a worn device. Pro Tech Monitoring, Larson & Larson P A, Frank Liebenow, April 20, 2010: US07701171 (35 worldwide citation)

A wearable device has an internal rechargeable power source for supplying power to internal circuitry of the device. An external rechargeable battery pack is physically and electrically interfaced to the wearable device and provides power to recharge the internal rechargeable power source while the ...


6
John C Defant, Robert P Posavec, David S Segal: House arrest tracker system. Pro Tech Monitoring, James E Larson, Larson & Larson PA, August 10, 2004: US06774799 (27 worldwide citation)

A docking station is located in an offender's home. It is connected to a transformer, and a telephone line. The docking station includes a processor board containing a microprocessor which receives the offender's home schedule from a central monitoring station via the telephone line and co ...


7
John C Defant, Robert P Posavec, David S Segal: Advanced house arrest tracker system. Pro Tech Monitoring, Larson & Larson PA, Frank Liebenow, Herbert Larson, October 10, 2006: US07119695 (24 worldwide citation)

A docking station is located in an offender's home. It is connected to a transformer, and a wireless modem. The docking station includes a processor board containing a microprocessor which receives the offender's home schedule from a central monitoring station via a cellular network and communicates ...


8
John C Defant, David S Segal: System, method and apparatus for locating and controlling objects. Pro Tech Monitoring, Larson & Larson, Frank Liebenow, April 17, 2007: US07205890 (20 worldwide citation)

A text message containing a natural language request is sent from an originating station to a central server. The server parses the request and uses the originating station identification to authorize the request and determine the address of the object. The server then sends a request to the address ...


9
Defant J Chris, Segal David, Chapin Steve: System, method and apparatus for charging a worn device. Pro Tech Monitoring, Defant J Chris, Segal David, Chapin Steve, LARSON Herbert W, March 8, 2007: WO/2007/027943 (5 worldwide citation)

A wearable device (10) has an internal rechargeable power source (112) for supplying power to internal circuitry of the device. An external rechargeable battery pack (30) is physically and electrically interfaced to the wearable device and provides power to recharge the internal rechargeable power s ...


10
Layson Jr Hoyt M: Portable tracking apparatus for continuous position determination of criminal offenders and victims. Pro Tech Monitoring, April 28, 1999: GB2330676-A (1 worldwide citation)

A portable locator or tracking apparatus (12) is provided for continuous location determination of subjects (16, 18) which communicates with a body-worn, non-removable tamper resistant transceiver (20) and a central data-base system (22). The portable tracking apparatus (12) has Global Position Syst ...