Patent US3767309A successfully refreshed from Google Patents.
US3767309A
Expired / Lapsed
US
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Visual surface guidance apparatus
Assignee: Lockheed Martin Corp
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Filing: 1970-07-22
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Granted: 1973-10-23
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Expires: 1990-07-22
Abstract
Abstract Guidance apparatus providing lateral and longitudinal visual guidance information to the operator of an aircraft or other vehicle to facilitate vehicular surface maneuvering. A light projection apparatus and a filter provide several multi-color laterally disposed beam segments to provide course guidance and also provide a longitudinal guidance beam portion positioned either above or below the laterally disposed segments to be undershot or overshot by the line of vision of the vehicle operator.
Inventors
- 👤 A Brown
- 👤 W Tygart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:53
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/002; G; G08; G08G; G08G9/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
An optical filter for use in a directional guidance apparatus having an optical system for projecting a beam of illumination in a predetermined direction along an illumination axis defining a desired path of travel, comprising: a first filter portion including a plurality of optically distinguishable filter segments each having a dimension extending along the filter in a direction parallel with an axis of the filter located substantially perpendicular to the illumination axis; said filter segments being serially disposed in a direction perpendicular to said filter axis, said dimension of at least one of said filter segments extending in said parallel direction on both sides of said filter axis to a location intermediate of the filter; and a second filter portion optically distinguishable from each of said filter segments and extending in said parallel direction relative to the filter axis from said intermediate location toward an extremity of the filter.
Claim 2
Dependent Claim
149 words
An optical filter for use in a directional guidance apparatus having an optical system for projecting a beam of illumination in a predetermined direction along an illumination axis defining a desired path of travel, comprising: a first filter portion including a plurality of optically distinguishable filter segments each having a dimension extending along the filter in a direction parallel with an axis of the filter located substantially perpendicular to the illumination axis; said filter segments being serially disposed in a direction perpendicular to said filter axis, said dimension of at least one of said filter segments extending in said parallel direction on both sides of said filter axis to a location intermediate of the filter; and a second filter portion optically distinguishable from each of said filter segments and extending in said parallel direction relative to the filter axis from said intermediate location toward an extremity of the filter.
Claim 3
Dependent Claim
22 words
A filter as in claim 1 wherein said one filter segment is of a color to denote a desired course of travel.
Claim 4
Dependent Claim
51 words
A filter as in claim 1 wherein said second filter portion extends along said intermediate location for substantially the entire breadth of the filter as measured in a direction perpendicular to said filter axis and extends in said direction parallel to said filter axis substantially to an extremity of the filter.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |