Patent US3963490A successfully refreshed from Google Patents.
US3963490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dye sensitized dichromated gelatin holographic material
Assignee: United States Department of the Air Force
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Filing: 1974-09-25
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Granted: 1976-06-15
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Expires: 1994-09-25
Abstract
Abstract A technique for increasing the spectral sensitivity of a dichromated gelatin holographic material by adding a spectrally sensitive dye to the holographic material.
Inventors
- 👤 Andrejs Graube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A method for increasing the spectral sensitivity of a dichromated gelatin-based hologram which comprises the steps of a. preparing an aqueous solution of gelatin and ammonium dichromate; b. casting said solution onto a glass substrate to form a substrate having a radiation sensitive dichromated gelatin layer; c. exposing said layered substrate to room light to preharden said gelatin layer; d. sensitizing said gelatin layer by immersing said layered substrate into a solution containing (1) a spectrally sensitive acid fast violet dye selected from the group consisting of the thiazine and triphenylmethane dyes and, (2) ammonium dichromate; e. drying said sensitized gelatin layer and then exposing said dried gelatin layer to the interfering beams of a He-Ne laser to give a 200 mJ/cm 2 average exposure; and f. developing said exposed gelatin layer to form a phase hologram containing a permanent fringe pattern from the said interfering laser beams.
Claim 2
Independent Claim
148 words
A method for increasing the spectral sensitivity of a dichromated gelatin-based hologram which comprises the steps of a. preparing an aqueous solution of gelatin and ammonium dichromate; b. casting said solution onto a glass substrate to form a substrate having a radiation sensitive dichromated gelatin layer; c. exposing said layered substrate to room light to preharden said gelatin layer; d. sensitizing said gelatin layer by immersing said layered substrate into a solution containing (1) a spectrally sensitive acid fast violet dye selected from the group consisting of the thiazine and triphenylmethane dyes and, (2) ammonium dichromate; e. drying said sensitized gelatin layer and then exposing said dried gelatin layer to the interfering beams of a He-Ne laser to give a 200 mJ/cm 2 average exposure; and f. developing said exposed gelatin layer to form a phase hologram containing a permanent fringe pattern from the said interfering laser beams.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |