US3878805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized horizon plane system
Assignee: Department of National Defence
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Filing: 1971-08-11
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Granted: 1975-04-22
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Expires: 1991-08-11
Abstract
Abstract A ship has a helicopter landing area and a horizontal plane indicating member with a substantially flat upper surface mounted for angular movement about axes parallel and transverse to the length of the ship. The indicator member is mounted in such a position on the ship and the flat upper surface is of such a size as to be clearly visible to the pilot of a helicopter when landing on the area. Means are provided for maintaining the indicating member in a horizontal attitude.
Inventors
- 👤 Duncan G Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:40
CPC Classifications
B; B63; B63G; B63G11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
The combination of: a ship having a helicopter landing area; a horizontal-plane indicator member with a substantially flat upper surface mounted for angular movement about axes parallel to and transverse to the length of the ship, the indicator member being mounted in such a position on the ship and the flat upper surface being of such a size as to be clearly visible to the pilot of a helicopter when landing on said area; means for maintaining the indicator member in a horizontal altitude; and electroluminescent tape secured to the upper surface of the indicator member only at the peripheral area thereof.
Claim 2
Dependent Claim
102 words
The combination of: a ship having a helicopter landing area; a horizontal-plane indicator member with a substantially flat upper surface mounted for angular movement about axes parallel to and transverse to the length of the ship, the indicator member being mounted in such a position on the ship and the flat upper surface being of such a size as to be clearly visible to the pilot of a helicopter when landing on said area; means for maintaining the indicator member in a horizontal altitude; and electroluminescent tape secured to the upper surface of the indicator member only at the peripheral area thereof.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |