US6529131B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic tether
Assignee: Individual
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Filing: 2001-06-13
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Granted: 2003-03-04
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Expires: 2021-06-13
Abstract
Abstract Apparatus for determining distance and location of a subordinate unit relative to a master unit. There may be a plurality of subordinate units for a single master unit. Both the master and subordinate unit(s) consist of a GPS receiver, RF transceiver, power supply, electronic compass, user interface and microprocessor. The master unit periodically polls and exchanges data with the subordinate unit via a RF transmission. The master unit processes the data and displays it on a display as distance and direction to a subordinate unit. The subordinate unit also processes data and displays it on a display as distance and direction to the master unit. Additionally, the master unit compares the data to user selectable predefined parameters. If the data is not within those parameters, the master unit initiates an alarm condition at both the master and subordinate unit.
Inventors
- 👤 Robert E. Wentworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:54
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/02; G08B21/0202; G08B21/0216; G08B21/0227; G08B21/023; G08B21/0263; G08B21/0294
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
A method of operating an electronic tether comprising the steps of: utilizing a master unit; utilizing at least one subordinate unit; placing into a memory of said master unit a unique address identifier of said subordinate unit that is to be supervised by said master unit; placing into a memory of said subordinate unit a unique address identifier of said master unit to which it is set to respond; establishing an acceptable distance and programming such into said master unit that a said subordinate unit may travel from said master unit before an alert indication is activated; and including within said master unit a call signal designed to be transmitted to a specific subordinate unit, and, upon activation of said call signal, trigger an alert indication on said subordinate unit which will also cause the displaying of the distance and direction of travel from the subordinate unit to the master unit.
Claim 2
Independent Claim
151 words
A method of operating an electronic tether comprising the steps of: utilizing a master unit; utilizing at least one subordinate unit; placing into a memory of said master unit a unique address identifier of said subordinate unit that is to be supervised by said master unit; placing into a memory of said subordinate unit a unique address identifier of said master unit to which it is set to respond; establishing an acceptable distance and programming such into said master unit that a said subordinate unit may travel from said master unit before an alert indication is activated; and including within said master unit a call signal designed to be transmitted to a specific subordinate unit, and, upon activation of said call signal, trigger an alert indication on said subordinate unit which will also cause the displaying of the distance and direction of travel from the subordinate unit to the master unit.
Claim 3
Independent Claim
184 words
A method of operating an electronic tether comprising the steps of: utilizing a master unit; utilizing at least one subordinate unit; placing into a memory of said master unit a unique address identifier of said subordinate unit that is to be supervised by said master unit; placing into a memory of said subordinate unit a unique address identifier of said master unit to which it is set to respond; establishing an acceptable distance and programming such into said master unit that a said subordinate unit may travel from said master unit before an alert indication is activated; initiating an alert signal at said master unit which is transmitted to said subordinate unit; displaying last known distance and direction to travel from said master unit to said subordinate unit; generating an alert signal transmission causing said subordinate unit to display said alert signal along with distance and direction of travel to said master unit based upon last known coordinates; and including programming into said master unit a power down instruction that is to be transmittable to said subordinate unit to shut off said subordinate unit.
Claim 4
Independent Claim
184 words
A method of operating an electronic tether comprising the steps of: utilizing a master unit; utilizing at least one subordinate unit; placing into a memory of said master unit a unique address identifier of said subordinate unit that is to be supervised by said master unit; placing into a memory of said subordinate unit a unique address identifier of said master unit to which it is set to respond; establishing an acceptable distance and programming such into said master unit that a said subordinate unit may travel from said master unit before an alert indication is activated; initiating an alert signal at said master unit which is transmitted to said subordinate unit; displaying last known distance and direction to travel from said master unit to said subordinate unit; generating an alert signal transmission causing said subordinate unit to display said alert signal along with distance and direction of travel to said master unit based upon last known coordinates; and including programming into said master unit a power down instruction that is to be transmittable to said subordinate unit to shut off said subordinate unit.
Claim 5
Independent Claim
276 words
A method of operating an electronic tether comprising the steps of: utilizing a master unit; utilizing at least one subordinate unit; placing into a memory of said master unit a unique address identifier of said subordinate unit that is to be supervised by said master unit; placing into a memory of said subordinate unit a unique address identifier of said master unit to which it is set to respond; establishing an acceptable distance and programming such into said master unit that a said subordinate unit may travel from said master unit before an alert indication is activated; upon failure by said master unit to receive an acceptable polling response from said subordinate unit, the following steps are caused to occur: verifying an invalid or missing response by repeating the polling procedure; comparing a last received and stored GPS data within said master unit with time of arrival of a signal from said subordinate unit by use of certain algorithms; initiating an alert signal at said master unit which is transmitted to said subordinate unit; displaying last known distance and direction to travel from said master unit to said subordinate unit; generating an alert signal transmission causing said subordinate unit to display said alert signal along with distance and direction of travel to said master unit based upon last known coordinates; continuing to poll said subordinate unit attempting to acquire new and valid data from said subordinate unit and updating a display within said master unit accordingly; and resolving an alert condition based on said alert signal by receiving acceptable coordinates from new GPS data or by means of acceptable range determination by time of arrival technique.
Claim 6
Independent Claim
276 words
A method of operating an electronic tether comprising the steps of: utilizing a master unit; utilizing at least one subordinate unit; placing into a memory of said master unit a unique address identifier of said subordinate unit that is to be supervised by said master unit; placing into a memory of said subordinate unit a unique address identifier of said master unit to which it is set to respond; establishing an acceptable distance and programming such into said master unit that a said subordinate unit may travel from said master unit before an alert indication is activated; upon failure by said master unit to receive an acceptable polling response from said subordinate unit, the following steps are caused to occur: verifying an invalid or missing response by repeating the polling procedure; comparing a last received and stored GPS data within said master unit with time of arrival of a signal from said subordinate unit by use of certain algorithms; initiating an alert signal at said master unit which is transmitted to said subordinate unit; displaying last known distance and direction to travel from said master unit to said subordinate unit; generating an alert signal transmission causing said subordinate unit to display said alert signal along with distance and direction of travel to said master unit based upon last known coordinates; continuing to poll said subordinate unit attempting to acquire new and valid data from said subordinate unit and updating a display within said master unit accordingly; and resolving an alert condition based on said alert signal by receiving acceptable coordinates from new GPS data or by means of acceptable range determination by time of arrival technique.
References Cited (Backward Citations)
US4777478A
Cited
US5289163A
Cited
US5892454A
Cited
US6181253B1
Cited
US5952959A
Cited
US5557259A
Cited
US6094164A
Cited
US5963130A
Cited
US6111541A
Cited
US5905461A
Cited
US5900817A
Cited
US6014080A
Cited
US6028514A
Cited
US6067018A
Cited
US6373430B1
Cited
US6127931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-03-03 | 2006-09-02 | 2007-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-03-03 | 2010-09-02 | 2011-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-03-03 | 2014-09-02 | 2015-03-04 | $7700.00 | Window Closed / Lapsed |