Patent US3985452A successfully refreshed from Google Patents.
US3985452A
Expired / Lapsed
US
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Arrangement for determining visibility in the glide path of an aircraft
Assignee: ABB Norden Holding AB
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Filing: 1975-03-17
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Granted: 1976-10-12
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Expires: 1995-03-17
Abstract
Abstract For determining oblique visibility, for example on an airport, a light emitter emits a light beam and is coupled with a light receiver. A plurality of devices are located at different, known distances from the light receiver, which launch measuring bodies substantially vertically with a predetermined height for each of the units. The measuring bodies are arranged to reflect the light emitted from the light emitter back to the light receiver where the visibility is sufficient. The devices are operated sequentially.
Inventors
- 👤 Magnus Bylander
- 👤 Bernt Ling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:53
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/88; G01S17/95; Y; Y02; Y02A; Y02A90/00; Y02A90/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
Arrangement for determining oblique visibility, comprises a light emitter arranged to emit a light beam and a light receiver, said emitter and receiver being ground-mounted, and a plurality of members, arranged at different distances from the light receiver, said members including means for launching measuring bodies in free flight in a substantially vertical path with a predetermined height for each member, each measuring body including means to reflect the light emitted from the light emitter against the light receiver if the visibility is sufficient.
Claim 2
Dependent Claim
84 words
Arrangement for determining oblique visibility, comprises a light emitter arranged to emit a light beam and a light receiver, said emitter and receiver being ground-mounted, and a plurality of members, arranged at different distances from the light receiver, said members including means for launching measuring bodies in free flight in a substantially vertical path with a predetermined height for each member, each measuring body including means to reflect the light emitted from the light emitter against the light receiver if the visibility is sufficient.
Claim 3
Dependent Claim
19 words
Arrangement according to claim 1, in which a measuring body comprises in its surface reflectors reflecting by total reflection.
Claim 4
Dependent Claim
23 words
Arrangement according to claim 1, in which the measuring bodies at times different from the measuring opportunities are substantially situated on ground level.
Claim 5
Dependent Claim
24 words
Arrangement according to claim 1, in which a measuring body is arranged to be positioned in said light beam twice during each measuring opportunity.
Claim 6
Dependent Claim
24 words
Arrangement according to claim 1, in which the arrangement comprises an interception device for intercepting the measuring body when it returns to ground level.
References Cited (Backward Citations)
US3126521A
Cited
US3694936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |