Patent US3660091A successfully refreshed from Google Patents.
US3660091A
Expired / Lapsed
US
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Passivation of dichromated gelatin holograms to high relative humidity ambients
Assignee: AT&T Inc
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Filing: 1970-04-13
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Granted: 1972-05-02
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Expires: 1990-04-13
Abstract
Abstract A method of passivating dichromated gelatin holograms to high relative humidity ambients is disclosed. The method involves a developing process whereby a dichromated gelatin hologram, which has been exposed to a laser light, is initially treated with a first solvent which both swells and photographically fixes the exposed hologram and also introduces a high relative humidity passivating species into the photographically fixed holographic film. The swollen and fixed hologram is then treated with a second solvent which both removes the first solvent and develops the hologram. A subsequent baking of the developed hologram passivates it to high relative humidity conditions.
Inventors
- 👤 Theodore Arthur Shankoff
- 👤 Constance Veronica Stanionis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:50
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
The method as defined in claim 1 wherein said dissolved CrO3 is present in an amount within the range 0.5 to 5 percent by weight of CrO3.
Claim 2
Dependent Claim
24 words
The method as defined in claim 1 wherein said first solution is maintained at a temperature in the range of 25* - 40* C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |