US5512902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stock locator system using GPS translator
Assignee: Northrop Grumman Systems Corp
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Filing: 1994-04-18
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Granted: 1996-04-30
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Expires: 2014-04-18
Abstract
Abstract A device which is useful in locating lost articles including a GPS translator, located in close proximity of said lost article. The GPS translator is capable of translating a frequency transmitted from a GPS transmitter to a GPS receiver, the GPS receiver is capable of receiving a first signal directly from the GPS transmitter, and a second signal transmitted from the GPS transmitter, through said GPS translator, to the GPS receiver. Since the translator typically uses considerable energy during continual usage, there is a power management portion included which actuates the translator only during those times that a coded signal is transmitted to the translator, which is typically transmitted by the user who is attempting to located the lost article.
Inventors
- 👤 Warren E. Guthrie
- 👤 John A. Haag
- 👤 Roger B. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:37
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/38; G01S19/39; G01S19/42; G01S5/00; G01S5/0009; G01S5/0018; G01S5/0036
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
136 words
In a global positioning system (GPS) including satellites orbiting the earth and transmitting positional information signals, a system for locating a lost article comprising: a mobile encoder transmitter/receiver device for transmitting a coded identification signal specifically corresponding to an identification number associated with a particular lost article, a decoder transmitter/receiver device affixed to said particular lost article, said decoder transmitter/receiver device being activated in response to said coded identification signal from said mobile encoder transmitter/receiver device to receive positional information signals from said GPS and to re-transmit said positional information as alternate, frequency shifted GPS positional information signals, wherein said mobile encoder transmitter/receiver device receives said alternate, frequency shifted GPS positional information signals re-transmitted from said decoder transmitter/receiver device and said positional information signals from said GPS to determine the position of said particular lost article.
Claim 2
Dependent Claim
136 words
In a global positioning system (GPS) including satellites orbiting the earth and transmitting positional information signals, a system for locating a lost article comprising: a mobile encoder transmitter/receiver device for transmitting a coded identification signal specifically corresponding to an identification number associated with a particular lost article, a decoder transmitter/receiver device affixed to said particular lost article, said decoder transmitter/receiver device being activated in response to said coded identification signal from said mobile encoder transmitter/receiver device to receive positional information signals from said GPS and to re-transmit said positional information as alternate, frequency shifted GPS positional information signals, wherein said mobile encoder transmitter/receiver device receives said alternate, frequency shifted GPS positional information signals re-transmitted from said decoder transmitter/receiver device and said positional information signals from said GPS to determine the position of said particular lost article.
Claim 3
Dependent Claim
43 words
A system according to claim 1 wherein said decoder transmitter/receiver device affixed to said particular lost article includes a power management circuit wherein said decoder transmitter/receiver device is turned on for selected time periods to receive said positional information signals from said GPS.
Claim 4
Dependent Claim
126 words
A system according to claim 1 wherein said decoder transmitter/receiver device affixed to said particular lost article includes an interface circuit for receiving said positional information signals from said GPS, for translating said received GPS positional signals, and for re-transmitting said translated GPS positional signals, a code receiver circuit for receiving said coded identification signal transmitted from said mobile encoder transmitter/receiver device, and a power management circuit, including a power supply means, responsive to a signal from said code receiver circuit for selectively connecting said power supply means to said interface circuit to activate said interface circuit to receive said positional information signals from said GPS and to activate said code receiver circuit to receive said coded identification signal transmitted from said mobile encoder transmitter/receiver device.
Claim 5
Dependent Claim
81 words
A system according to claim 3 wherein said interface circuit includes a GPS receive antenna for receiving said positional information signals from said GPS, a mixer circuit connected to said GPS receive antenna, a local oscillator connected to said mixer circuit for shifting the frequency of said received GPS positional information signals to provide translated GPS positional signals, and a GPS re-transmit antenna connected to said mixer to transmit said translated GPS positional signals to said mobile encoder transmitter receiver device.
Claim 6
Dependent Claim
26 words
A system according to claim 4 wherein, said power management circuit activates said interface circuit only during those periods that said interface circuit is being utilized.
Claim 7
Dependent Claim
36 words
A system according to claim 5 further including: analysis timer means for maintaining power to said power management circuit for a predetermined period after the coded identification signal directed to said interface circuit has been detected.
Claim 8
Dependent Claim
37 words
A system according to claim 1 wherein said mobile encoder transmitter/receiver device includes a GPS receiver circuit for selectively receiving said positional information signals from said GPS, and said re-transmitted positional signals from said decoder transmitter/receiver device.
Claim 9
Dependent Claim
55 words
A system according to claim 7 wherein said mobile encoder transmitter/receiver device further includes means for generating said coded identification signal corresponding to an identification number associated with a particular list article, and a code transmitter connected to said coded identification signal generating means for transmitting said coded identification signal to said decoder transmitter/receiver device.
Claim 10
Dependent Claim
43 words
A system according to claim 7 wherein said GPS receiver circuit includes a first receiver circuit for receiving said positional information signals from said GPS and a second receiver circuit for receiving said re-transmitted GPS translated positional signals from said decoder transmitter/receiver device.
Claim 11
Dependent Claim
52 words
A system according to claim 7 wherein said mobile encoder transmitter/receiver device further includes a mixer circuit connected to said GPS receiver circuit, and responsive to said re-transmitted, translated GPS positional information signals, and a local oscillator circuit connected to said mixer circuit for re-translating said re-transmitted translated GPS positional information signals.
Claim 12
Dependent Claim
37 words
A system according to claim 4 wherein said mobile encoder transmitter/receiver device includes a GPS receiver circuit for selectively receiving positional information signals from said GPS, and re-transmitted translated GPS positional signals from said decoder transmitter/receiver device.
Claim 13
Dependent Claim
55 words
A system according to claim 11 wherein said mobile encoder transmitter/receiver device further includes means for generating said coded identification signal corresponding to an identification number associated with a particular lost article, and a code transmitter connected to said coded identification signal generating means for transmitting said coded identification signal to said decoder transmitter/receiver device.
Claim 14
Dependent Claim
43 words
A system according to claim 11 wherein said GPS receiver circuit includes a first receiver circuit for receiving said positional information signals from said GPS and a second receiver circuit for receiving said re-transmitted GPS translated positional signals from said decoder transmitter/receiver device.
Claim 15
Dependent Claim
52 words
A system according to claim 11 wherein said mobile encoder transmitter/receiver device further includes a mixer circuit connected to said GPS receiver circuit, and responsive to said re-transmitted, translated GPS positional information signals, and a local oscillator circuit connected to said mixer circuit for re-translating said re-transmitted translated GPS positional information signals.
Claim 16
Independent Claim
84 words
A method for locating a lost article, comprising the steps of: transmitting a coded signal from a local encoder transmitter, to a decoder receiver, said coded signal representing an identification number designating said decoder receiver to actuate said decoder receiver, said decoder receiver being located in the proximity of said lost article; translating a GPS positional information signal into a modified frequency; and determining a location of said decoder receiver by comparing said modified signal in said decoder receiver to a direct GPS signal.
Claim 17
Independent Claim
84 words
A method for locating a lost article, comprising the steps of: transmitting a coded signal from a local encoder transmitter, to a decoder receiver, said coded signal representing an identification number designating said decoder receiver to actuate said decoder receiver, said decoder receiver being located in the proximity of said lost article; translating a GPS positional information signal into a modified frequency; and determining a location of said decoder receiver by comparing said modified signal in said decoder receiver to a direct GPS signal.
Claim 18
Dependent Claim
31 words
The method as described in claim 15, further comprising the step of: actuating the decoder receiver only at times when said coded signal is received, and for a predetermined period thereafter.
Claim 19
Dependent Claim
28 words
The method as described in claim 15, further comprising the step of: monitoring said coded signal, by a power management circuit in said which is said decoder receiver.
Claim 20
Dependent Claim
50 words
The method as described in claim 15, wherein said monitoring step consists of turning said power management circuit on and off at such a rate that it can determine whether a coded signal, which may be being transmitted to said decoder receiver, is indeed being transmitted to said decoder receiver.
Claim 21
Dependent Claim
37 words
The method as described in claim 15, further comprising the step of: actuating the decoder receiver only at times when said coded signal is received, and deactivating said decoder receiver upon the receipt of another coded signal.
Claim 22
Independent Claim
149 words
A method using a global positioning system (GPS) including satellites orbiting the earth and transmitting positional information signals, a system for locating a lost article comprising the steps of: Step 1. transmitting from a mobile encoder transmitter/receiver devices a coded identification signal specifically corresponding to an identification number associated with a particular lost article, Step 2. receiving said coded identification signal in a decoder transmitter/receiver device affixed to said particular lost article, Step 3. activating said decoder transmitter/receiver device in response to said coded identification signal from said modible encoder transmitter/receiver device, Step 4. receiving positional information signals from said GPS, Step 5. re-transmitting said positional information as alternate, frequency shifted GPS positional information signals, Step 6. determining the position of said particular lost article by receiving said alternate, frequency shifted GPS positional information signals re-transmitted from said decoder transmitter/receiver device and said positional information signals from said GPS.
Claim 23
Independent Claim
149 words
A method using a global positioning system (GPS) including satellites orbiting the earth and transmitting positional information signals, a system for locating a lost article comprising the steps of: Step 1. transmitting from a mobile encoder transmitter/receiver devices a coded identification signal specifically corresponding to an identification number associated with a particular lost article, Step 2. receiving said coded identification signal in a decoder transmitter/receiver device affixed to said particular lost article, Step 3. activating said decoder transmitter/receiver device in response to said coded identification signal from said modible encoder transmitter/receiver device, Step 4. receiving positional information signals from said GPS, Step 5. re-transmitting said positional information as alternate, frequency shifted GPS positional information signals, Step 6. determining the position of said particular lost article by receiving said alternate, frequency shifted GPS positional information signals re-transmitted from said decoder transmitter/receiver device and said positional information signals from said GPS.
References Cited (Backward Citations)
US4359733A
Cited
US4839656A
Cited
US4819053A
Cited
US4740792A
Cited
US4924699A
Cited
US5033109A
Cited
US5027428A
Cited
US4995099A
Cited
US5003619A
Cited
US4961073A
Cited
US5025251A
Cited
US5119102A
Cited
US5111209A
Cited
US5185610A
Cited
US5155490A
Cited
US5160935A
Cited
US5210540A
Cited
US5148179A
Cited
US5379224A
Cited
US5392052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-30 | 1999-10-30 | 2000-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-30 | 2003-10-30 | 2004-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-30 | 2007-10-30 | 2008-04-30 | $7700.00 | Window Closed / Lapsed |