Patent US3633988A successfully refreshed from Google Patents.
US3633988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helmet-mounted holographic aiming sight
Assignee: United States Department of the Navy
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Filing: 1970-07-10
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Granted: 1972-01-11
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Expires: 1990-07-10
Abstract
Abstract A head-coupled sighting reticle having a hologram incorporated in a helmet faceplate illuminated by a point source of light. The hologram is constructed by creating a spherical-plane waveinterference pattern. In operation, the pilot looks through the hologram, and superimposes the virtual image of a point source, or other configuration, on the target. The pilot''s head position then indicates the direction to the target.
Inventors
- 👤 Reed A Farrar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:00
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/017; G02B27/0172; G02B5/00; G02B5/32; G02B27/0101; G02B2027/0143
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A sight for indicating the direction to a target, comprising: a helmet to be worn by an aircraft pilot; an at least semitransparent visor mounted on said helmet, including an at least semitransparent, spherical-plane waveinterference pattern hologram positioned in covering relationship to one of said pilot''s eyes when said pilot is wearing said helmet; means for illuminating said hologram such that a virtual image of at least one point source is seen by said pilot wearing said helmet when he views said target, including an illuminating, spherical wave source and at least one fiber optic for transmitting the illumination of said source to said hologram; whereby the direction to said target is indicated by superimposing said virtual image on said target.
Claim 2
Dependent Claim
121 words
A sight for indicating the direction to a target, comprising: a helmet to be worn by an aircraft pilot; an at least semitransparent visor mounted on said helmet, including an at least semitransparent, spherical-plane waveinterference pattern hologram positioned in covering relationship to one of said pilot''s eyes when said pilot is wearing said helmet; means for illuminating said hologram such that a virtual image of at least one point source is seen by said pilot wearing said helmet when he views said target, including an illuminating, spherical wave source and at least one fiber optic for transmitting the illumination of said source to said hologram; whereby the direction to said target is indicated by superimposing said virtual image on said target.
Claim 3
Dependent Claim
17 words
The sight of claim 1 wherein said hologram is constructed in hologram-recording material integral to said visor.
Claim 4
Dependent Claim
12 words
The sight of claim 1 wherein said hologram attached to said visor.
Claim 5
Dependent Claim
13 words
The sight of claim 1 wherein said spherical wave source is a laser.
Claim 6
Dependent Claim
15 words
The sight of claim 1 wherein the hologram-recording material of said hologram comprises dichromated gelatin.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |