Patent US3226713A successfully refreshed from Google Patents.
US3226713A
Expired / Lapsed
US
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Precision tracking system
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1963-10-31
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Granted: 1965-12-28
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Expires: 1983-10-31
Abstract
No abstract record available.
Inventors
- 👤 Sorkin Morris
- 👤 Don M Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:43
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A COOPERATIVE TRACKING SYSTEM COMPRISING MEANS FOR RADIATING A CONTINUOUS WAVE (C.W.) SIGNAL FROM A MOVING VEHICLE. AT LEAST THREE COOPERATIVE TRTANSPONDERS LOCATED AT FIXED REMOTE POSITIONS FOR RECEIVING SAID C.W. SIGNAL, EACH OF SAID TRANSPONDERS TRANSMITTING A C.W. SIGNAL TO SAID VEHICLE THAT IS PHASE COHERENT WITH SAID RECEIVED SIGNAL, AND MEANS IN SAID VEHICLE FOR RECEIVING EACH OF SAID RECEIVED TRANSPONDER SIGNALS AND COMPARING THE PHASE OF SAID RECEIVED SIGNALS WITH SID TRANSMITTED SIGNAL THEREBY EXTRACTING THE DOPPLER PHASE SHIFT IN EACH OF SAID RECEIVED SIGNALS.
Claim 2
Dependent Claim
88 words
A COOPERATIVE TRACKING SYSTEM COMPRISING MEANS FOR RADIATING A CONTINUOUS WAVE (C.W.) SIGNAL FROM A MOVING VEHICLE. AT LEAST THREE COOPERATIVE TRTANSPONDERS LOCATED AT FIXED REMOTE POSITIONS FOR RECEIVING SAID C.W. SIGNAL, EACH OF SAID TRANSPONDERS TRANSMITTING A C.W. SIGNAL TO SAID VEHICLE THAT IS PHASE COHERENT WITH SAID RECEIVED SIGNAL, AND MEANS IN SAID VEHICLE FOR RECEIVING EACH OF SAID RECEIVED TRANSPONDER SIGNALS AND COMPARING THE PHASE OF SAID RECEIVED SIGNALS WITH SID TRANSMITTED SIGNAL THEREBY EXTRACTING THE DOPPLER PHASE SHIFT IN EACH OF SAID RECEIVED SIGNALS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |