US3259985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual approach guidance system for landing aircraft
Assignee: De Havilland Aircraft of Canada Ltd
•
Filing: 1962-04-18
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Granted: 1966-07-12
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Expires: 1982-04-18
Abstract
No abstract record available.
Inventors
- 👤 Neal George Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:31
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A VISUAL APPROACH GUIDANCE SYSTEM FOR LANDING AIRCRAFT ON AN AIR STRIP HAVING A PREDETERMINED TOUCH DOWN POINT THEREON AND COMPRISING: A PLURALITY OF TARGET MEANS TO ONE SIDE OF SAID AIR STRIP LOCATED SUBSTANTIALLY BESIDE SAID TOUCH DOWN POINT AND OF A PREDETERMINED HEIGHT Y BETWEEN UPPER AND LOWER EDGES THEREOF; AND A SIGHTING MEMBER OF A HEIGHT BETWEEN UPPER AND LOWER EDGES THEREOF SUBSTANTIALLY EQUAL TO THE SAID HEIGHT DIMENSION Y AND POSITIONED BESIDE SAID AIR STRIP A DISTANCE L IN ADVANCE OF SAID TARGET MEANS AND A HEIGHT H ABOVE THE LOWER MARGIN OF SAID TARGET MEANS TO DEFINE A LINE OF SIGHT WHEN SAID SIGHTING MEANS APPEARS TO THE EYE TO COVER SAID TARGET MEANS OF AN ANGLE A DEFINING AN APPROACH ANGLE FOR AN AIRCRAFT APPROACHING SAID AIR STRIP, THE UPPER EDGE OF SAID SIGHTING MEANS BEING ADAPTED TO BE SIGHTED ON THE LOWER EDGE OF SAID TARGER MEANS THEREBY TO DEFINE A HIGH ANGLE OF APPROACH DESCRIBED BY THE RELATION
Claim 2
Dependent Claim
166 words
A VISUAL APPROACH GUIDANCE SYSTEM FOR LANDING AIRCRAFT ON AN AIR STRIP HAVING A PREDETERMINED TOUCH DOWN POINT THEREON AND COMPRISING: A PLURALITY OF TARGET MEANS TO ONE SIDE OF SAID AIR STRIP LOCATED SUBSTANTIALLY BESIDE SAID TOUCH DOWN POINT AND OF A PREDETERMINED HEIGHT Y BETWEEN UPPER AND LOWER EDGES THEREOF; AND A SIGHTING MEMBER OF A HEIGHT BETWEEN UPPER AND LOWER EDGES THEREOF SUBSTANTIALLY EQUAL TO THE SAID HEIGHT DIMENSION Y AND POSITIONED BESIDE SAID AIR STRIP A DISTANCE L IN ADVANCE OF SAID TARGET MEANS AND A HEIGHT H ABOVE THE LOWER MARGIN OF SAID TARGET MEANS TO DEFINE A LINE OF SIGHT WHEN SAID SIGHTING MEANS APPEARS TO THE EYE TO COVER SAID TARGET MEANS OF AN ANGLE A DEFINING AN APPROACH ANGLE FOR AN AIRCRAFT APPROACHING SAID AIR STRIP, THE UPPER EDGE OF SAID SIGHTING MEANS BEING ADAPTED TO BE SIGHTED ON THE LOWER EDGE OF SAID TARGER MEANS THEREBY TO DEFINE A HIGH ANGLE OF APPROACH DESCRIBED BY THE RELATION
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |