Patent US3989530A successfully refreshed from Google Patents.
US3989530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recording phase holograms using energy-activated sensitizer
Assignee: Individual
•
Filing: 1976-02-11
•
Granted: 1976-11-02
•
Expires: 1996-02-11
Abstract
Abstract Phase holograms are recorded in the visible with high efficiency by the use of a transparent photosensitive recording composition containing a transparent thermochromic electrochromic or photochromic compound capable of forming a chromatic sensitizer temporarily in situ in the composition when under the influence of external physical excitation appropriate to the nature of the compound, namely heat, an electric field or irradiation. In the process of recording, the physical excitation is applied and maintained during the duration of the recording, whereafter the physical excitation is terminated and the recording composition becomes transparent again leaving the recording constituted solely by local refractive index variations.
Inventors
- 👤 Jean Jules Achille Robillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:12
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/56; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
A process for recording phase holograms by holographically exposing a layer of a transparent photosensitive recording composition to radiation in the visible light range for a period of time to effect a change in the index of refraction of said layer in correspondingly exposed areas, said recording composition being selected from photopolymerizable and photodegradable compositions, said recording composition is temporarily sensitized to said radiation by a chromatic sensitizer formed in situ and maintained in said recording composition by means of a sensitizing auxiliary energy outside said visible light range applied to said recording composition for the duration of said exposure, said duration being sufficient to cause a corresponding photopolymerization or photodegradation and effecting local variations of refractive index in the exposed areas of said recording composition, and then ceasing to apply said sensitizing energy to said recording composition, thereby effecting the disappearance of said sensitizer in said recording composition and returning said recording composition to its normally transparent state.
Claim 2
Dependent Claim
159 words
A process for recording phase holograms by holographically exposing a layer of a transparent photosensitive recording composition to radiation in the visible light range for a period of time to effect a change in the index of refraction of said layer in correspondingly exposed areas, said recording composition being selected from photopolymerizable and photodegradable compositions, said recording composition is temporarily sensitized to said radiation by a chromatic sensitizer formed in situ and maintained in said recording composition by means of a sensitizing auxiliary energy outside said visible light range applied to said recording composition for the duration of said exposure, said duration being sufficient to cause a corresponding photopolymerization or photodegradation and effecting local variations of refractive index in the exposed areas of said recording composition, and then ceasing to apply said sensitizing energy to said recording composition, thereby effecting the disappearance of said sensitizer in said recording composition and returning said recording composition to its normally transparent state.
Claim 3
Dependent Claim
31 words
A process for recording phase holograms as in claim 1, wherein said recording composition includes a thermochrome compound which forms said chromatic sensitizer when said sensitizing auxiliary energy is thermal energy.
Claim 4
Dependent Claim
31 words
A process for recording phase holograms as in claim 1, wherein said recording composition includes a photochrome compound which forms said chromatic sensitizer when said sensitizing auxiliary energy is ultraviolet radiation.
Claim 5
Dependent Claim
36 words
A process for recording phase holograms as in claim 1, wherein said recording composition includes an electrochrome compound which forms said chromatic sensitizer when said sensitizing auxiliary energy is electrical energy applied across said recording composition.
Claim 6
Dependent Claim
126 words
A process for recording phase holograms, including the steps of: preparing a normally transparent photosensitive recording composition, wherein said recording composition is selected from photopolymerizable and photodegradable compositions; chromatically sensitizing said recording composition by applying a sensitizing energy outside the visible light range to said recording composition whereby a chromatic sensitizer is temporarily formed in situ and maintained therein; holographically exposing said recording composition with radiation, in the visible light range, to effect local variations of refractive index in the exposed, sensitized areas of said recording composition; desensitizing said recording composition by ceasing to apply said sensitizing energy to said recording composition, thereby returning said recording composition to its normally transparent state with local variations of index of refraction according to said step of holographic exposure.
Claim 7
Dependent Claim
126 words
A process for recording phase holograms, including the steps of: preparing a normally transparent photosensitive recording composition, wherein said recording composition is selected from photopolymerizable and photodegradable compositions; chromatically sensitizing said recording composition by applying a sensitizing energy outside the visible light range to said recording composition whereby a chromatic sensitizer is temporarily formed in situ and maintained therein; holographically exposing said recording composition with radiation, in the visible light range, to effect local variations of refractive index in the exposed, sensitized areas of said recording composition; desensitizing said recording composition by ceasing to apply said sensitizing energy to said recording composition, thereby returning said recording composition to its normally transparent state with local variations of index of refraction according to said step of holographic exposure.
Claim 8
Dependent Claim
30 words
A process for recording phase holograms as in claim 5, wherein said recording composition includes a thermochrome compound which forms said chromatic sensitizer when said sensitizing energy is thermal energy.
Claim 9
Dependent Claim
30 words
A process for recording phase holograms as in claim 5, wherein said recording composition includes a photochrome compound which forms said chromatic sensitizer when said sensitizing energy is ultraviolet radiation.
Claim 10
Dependent Claim
35 words
A process for recording phase holograms as in claim 5, wherein said recording composition includes an electrochrome compound which forms said chromatic sensitizer when said sensitizing energy is electrical energy applied across said recording composition.
References Cited (Backward Citations)
US3617274A
Cited
US3658526A
Cited
US3689264A
Cited
US3723121A
Cited
US3707371A
Cited
US3655256A
Cited
US3820995A
Cited
US3926637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |