US3884552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Invisible to visible light image converter
Assignee: United States Department of the Army
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Filing: 1973-10-05
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Granted: 1975-05-20
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Expires: 1993-10-05
Abstract
Abstract A simple image converter is provided which includes a hologram developed after a Lippmann type exposure to a visible monochromatic light source, then re-exposed to an invisible light image and a visible light source simultaneously.
Inventors
- 👤 Reinhold Gerharz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:30
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/12; G02B5/00; G02B5/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
146 words
An inviSible to visible light image converter comprising: an optical platform; a Lippmann type space grating filter plate consisting of a layer of photographic emulsion having a multilayered lattice type of space grating imbedded therein having first and second broad surfaces and mounted in a first fixed position on said platform; a localized source of visible light mounted in a second fixed position on said platform and having a beam angle and direction to fully illuminate said first broad surface of said plate; a plane mirror mounted in a third fixed position on said platform with said first position between said second and third, said mirror also being within the beam angle from said source and oriented to fully illuminate said second broad surface; and an objective optical means also mounted on said platform to project an invisible image of a distant object on said plate.
Claim 2
Dependent Claim
146 words
An inviSible to visible light image converter comprising: an optical platform; a Lippmann type space grating filter plate consisting of a layer of photographic emulsion having a multilayered lattice type of space grating imbedded therein having first and second broad surfaces and mounted in a first fixed position on said platform; a localized source of visible light mounted in a second fixed position on said platform and having a beam angle and direction to fully illuminate said first broad surface of said plate; a plane mirror mounted in a third fixed position on said platform with said first position between said second and third, said mirror also being within the beam angle from said source and oriented to fully illuminate said second broad surface; and an objective optical means also mounted on said platform to project an invisible image of a distant object on said plate.
Claim 3
Dependent Claim
21 words
An image converter according to claim 1 wherein; said plane mirror is attached to said second broad surface of said plate.
Claim 4
Dependent Claim
30 words
The image converter according to claim 1 wherein said objective optical means includes: filter means for absorbing at least the visible light radiating from said distant object and its surroundings.
Claim 5
Dependent Claim
26 words
The image converter according to claim 1 wherein an optical eyepiece means is mounted on said platform to enlarge the visible image formed on said plate.
Claim 6
Dependent Claim
23 words
The image converter according to claim 4 wherein: said eyepiece includes a filter means to pass only frequencies generated by said localized source.
Claim 7
Dependent Claim
14 words
The image converter according to claim 5 wherein said localized source produces white light.
Claim 8
Dependent Claim
15 words
The image converter according to claim 5 wherein said localized source produces substantially monochromatic light.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |