US4028104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared hologram recording method
Assignee: Raytheon Co
•
Filing: 1975-04-21
•
Granted: 1977-06-07
•
Expires: 1995-04-21
Abstract
Abstract A process is disclosed whereby infrared holograms can be recorded in photographic silver halide emulsions as positive images. High resolution holograms have been produced with 1.06 μm radiation in photographic plates by utilizing the Herschel reversal effect.
Inventors
- 👤 Andrejs Graube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:56
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/485; G03C1/48592; G03C5/00; G03C5/16; G03C5/164; G03C5/26; G03C5/40; G03C5/44; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
40 words
A method of fabricating infrared holograms from silver halide emulsion photographic plates or films comprising, first exposing said plates to visible light, second uniformly exposing said plates or films to holographic infrared radiation and developing said exposed plates or films.
Claim 2
Independent Claim
40 words
A method of fabricating infrared holograms from silver halide emulsion photographic plates or films comprising, first exposing said plates to visible light, second uniformly exposing said plates or films to holographic infrared radiation and developing said exposed plates or films.
Claim 3
Dependent Claim
37 words
A method of fabricating infrared holograms exhibiting high diffraction efficiencies and high spatial frequencies from photographic plates or films comprised of the steps of claim 1 plus the additional step of bleaching said exposed plates or films.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein said bleaching step is achieved by exposing said exposed plates or film to bromine vapors.
Claim 5
Dependent Claim
31 words
The method of claim 2 wherein said white light is obtained from an incandescent bulb, and said infrared radiation is obtained from a Nd; YAG laser producing 1.06 μm wavelength radiation.
Claim 6
Independent Claim
71 words
A method of fabricating infrared holograms comprising the steps of: a. uniformly exposing a photographic plate or film, comprised of a silver halide emulsion, to visible light whereby the sensitivity of said film or plate is extended to 1 + 0.25 μm wavelength range, b. subsequently subjecting said plate or film to a holographic infrared radiation exposure until the desired optical density reduction is achieved, and c. developing said exposed plate.
Claim 7
Independent Claim
71 words
A method of fabricating infrared holograms comprising the steps of: a. uniformly exposing a photographic plate or film, comprised of a silver halide emulsion, to visible light whereby the sensitivity of said film or plate is extended to 1 + 0.25 μm wavelength range, b. subsequently subjecting said plate or film to a holographic infrared radiation exposure until the desired optical density reduction is achieved, and c. developing said exposed plate.
Claim 8
Dependent Claim
36 words
A method of fabricating infrared holograms exhibiting high diffraction efficiencies and high spatial frequencies comprised of the steps of claim 5 plus the subsequent step of bleaching said developed plate via exposing said plate bromine vapors.
Claim 9
Dependent Claim
31 words
The method of claim 6 wherein said visible light is obtained from an incandescent bulb, and said infrared radiation is obtained from an Nd: YAG laser producing 1.06 μm wavelength radiation.
References Cited (Backward Citations)
US3158478A
Cited
US3178997A
Cited
US3642477A
Cited
US3556631A
Cited
US3811885A
Cited
US3685997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |