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US4451412A
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US
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Process for producing diffracting phase structures
Assignee: Thales SA
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Filing: 1982-09-29
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Granted: 1984-05-29
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Expires: 2002-09-29
Abstract
Abstract This invention concerns a process for producing diffracting phase structures in an interaction medium, which is formed of microballs of material in suspension in a polymerizable liquid. When illumination rings have been recorded by the interference of two light waves, they are fixed in situ by exposing the mixture to ultraviolet radiation.
Inventors
- 👤 Brigitte Loiseaux
- 👤 Jean P. Huignard
- 👤 Jean C. Dubois
- 👤 Armand Eranian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:16
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/0005; G03F7/001; G02; G02B; G02B5/00; G02B5/18; G02B5/1847; G02B5/1857; G02B5/1866; G02B5/1871; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/124
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
A process for producing diffracting phase structures comprising a medium formed of microballs of dielectric material in suspension in a liquid, in which two light waves interfere, the said process comprising one stage during which these two light waves are made to interfere in the medium, thereby recording their interference network in the medium, and, the liquid being polymerizable, a second stage in which the medium is solidified by exposing it to energy radiation, thereby fixing the interference network in situ.
Claim 2
Dependent Claim
81 words
A process for producing diffracting phase structures comprising a medium formed of microballs of dielectric material in suspension in a liquid, in which two light waves interfere, the said process comprising one stage during which these two light waves are made to interfere in the medium, thereby recording their interference network in the medium, and, the liquid being polymerizable, a second stage in which the medium is solidified by exposing it to energy radiation, thereby fixing the interference network in situ.
Claim 3
Dependent Claim
17 words
A process as defined in claim 1, in which the energy radiation is formed of ultraviolet rays.
Claim 4
Dependent Claim
29 words
A process as defined in claim 1, in which, in the first stage, the two light waves arrive from the same side of the medium, and interfere by transmission.
Claim 5
Dependent Claim
28 words
A process as defined in claim 1, in which, in the first stage, the two light waves arrive from opposite sides of the medium, and interfere by reflection.
Claim 6
Dependent Claim
15 words
A process as defined in claim 1, in which the microballs are made of latex.
Claim 7
Dependent Claim
15 words
A process as defined in claim 1, in which the microballs are made of glass.
Claim 8
Dependent Claim
15 words
A process as defined in claim 1, in which the polymerizable liquid contains a photosensitizer.
Claim 9
Dependent Claim
18 words
A process as defined in claim 7, in which the photosensitizer belongs to the family of diazoic compounds.
Claim 10
Dependent Claim
18 words
A process as defined in claim 7, in which the photosensitizer is benzoin or one of its derivatives.
Claim 11
Dependent Claim
18 words
A process as defined in claim 7, in which the photosensitizer is benzophenone or one of its derivatives.
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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |