US3153230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terrain clearance system
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1959-06-02
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Granted: 1964-10-13
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Expires: 1979-06-02
Abstract
No abstract record available.
Inventors
- 👤 Edward R Van Krevelen
- 👤 Norman G Horning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:30
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/93; G01S13/933; G01S13/935
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
A TERRAIN CLEARANCE SYSTEM FOR USE WITH AN AIRCRAFT RADAR SET, SAID RADAR SET PRODUCING AN "A" SCOPE TYPE OF SIGNAL, SAID SIGNAL HAVING PORTIONS THEREOF INDICATIVE OF THE PRESENCE OF ANY OBSTACLES IN THE PATH OF A TRANSMITTED RADAR SIGNAL FROM SAID RADAR SET AND OTHER PORTIONS INDICATIVE OF THE LENGTH OF SHADOWS CAST BY SAID OBSTACLES, INTEGRATING MEANS FOR DERIVING A VOLTAGE SIGNAL FROM SAID RECEIVED SIGNAL IN WHICH THE VOLTAGE OF SAID DERIVED SIGNAL VARIES IN VALUE IN ACCORDANCE WITH THE LENGTH OF EACH SHADOW, MEANS FOR PROVIDING A REFERENCE VOLTAGE SIGNAL THE VALUE OF SAID REFERENCE SIGNAL HAVING BEEN SELECTED SUCH THAT IT APPEARS TO BE A SHADOW CAST BY AN OBSTACLE THAT WOULD BE AVOIDED BY THE AIRCRAFT WITHIN A PRESCRIBED FLIGHT RANGE WITH RESPECT TO SUCH AN OBSTACLE, AND MEANS FOR COMPARING SAID DERIVED SIGNAL WITH SAID REFERENCE SIGNAL, TO ASCERTAIN WHETHER A SAFE COURSE IS BEING TRAVERSED BY THE AIRCRAFT EQUIPPED WITH SAID RADAR SET WHEN SAID AIRCRAFT IS WITHIN SAID PRESCRIBED FLIGHT RANGE IN RELATION TO AN ACTUAL OBSTACLE CASTING A SHADOW APPEARING IN SAID "A" SCOPE SIGNAL.
Claim 2
Dependent Claim
186 words
A TERRAIN CLEARANCE SYSTEM FOR USE WITH AN AIRCRAFT RADAR SET, SAID RADAR SET PRODUCING AN "A" SCOPE TYPE OF SIGNAL, SAID SIGNAL HAVING PORTIONS THEREOF INDICATIVE OF THE PRESENCE OF ANY OBSTACLES IN THE PATH OF A TRANSMITTED RADAR SIGNAL FROM SAID RADAR SET AND OTHER PORTIONS INDICATIVE OF THE LENGTH OF SHADOWS CAST BY SAID OBSTACLES, INTEGRATING MEANS FOR DERIVING A VOLTAGE SIGNAL FROM SAID RECEIVED SIGNAL IN WHICH THE VOLTAGE OF SAID DERIVED SIGNAL VARIES IN VALUE IN ACCORDANCE WITH THE LENGTH OF EACH SHADOW, MEANS FOR PROVIDING A REFERENCE VOLTAGE SIGNAL THE VALUE OF SAID REFERENCE SIGNAL HAVING BEEN SELECTED SUCH THAT IT APPEARS TO BE A SHADOW CAST BY AN OBSTACLE THAT WOULD BE AVOIDED BY THE AIRCRAFT WITHIN A PRESCRIBED FLIGHT RANGE WITH RESPECT TO SUCH AN OBSTACLE, AND MEANS FOR COMPARING SAID DERIVED SIGNAL WITH SAID REFERENCE SIGNAL, TO ASCERTAIN WHETHER A SAFE COURSE IS BEING TRAVERSED BY THE AIRCRAFT EQUIPPED WITH SAID RADAR SET WHEN SAID AIRCRAFT IS WITHIN SAID PRESCRIBED FLIGHT RANGE IN RELATION TO AN ACTUAL OBSTACLE CASTING A SHADOW APPEARING IN SAID "A" SCOPE SIGNAL.
References Cited (Backward Citations)
US3086200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-13 | 1968-04-13 | 1968-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-13 | 1972-04-13 | 1972-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-13 | 1976-04-13 | 1976-10-13 | $7700.00 | Window Closed / Lapsed |