US4853306A
Expired / Lapsed
US
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Method and apparatus for dehydrating dichromatic gelatin holograms
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1987-09-21
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Granted: 1989-08-01
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Expires: 2007-09-21
Abstract
Abstract A method of manufacturing optical elements, such as for head-up displays, from holographically recorded interference patterns in a dichromatic gelatin is disclosed. The exposed hologram pattern is developed through hydration, the hydrated hologram gelatin is dehydrated by contacting the hydrated gelatin with a mixture of isopropyl alcohol and an inert anhydrous fluid, such as a liquid fluorinated hydrocarbon solution. The dehydrated hologram pattern can then be subsequently stabilized, for example, by baking.
Inventors
- 👤 John E. Wreede
- 👤 James E. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:22
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/22; G03H; G03H1/00; G03H1/04; G03H1/18
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
53 words
In a method of developing a holographically recorded interference pattern in a dichromated gelatin that has been initially subjected to a hydration bath and will be subsequently stabilized, the improvement of dehydration, comprising: contacting the hydrated gelatin with a mixture of alcohol and a liquid fluorinated hydrocarbon solution to dehydrate the dichromated gelatin.
Claim 2
Dependent Claim
53 words
In a method of developing a holographically recorded interference pattern in a dichromated gelatin that has been initially subjected to a hydration bath and will be subsequently stabilized, the improvement of dehydration, comprising: contacting the hydrated gelatin with a mixture of alcohol and a liquid fluorinated hydrocarbon solution to dehydrate the dichromated gelatin.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the mixture of alcohol and liquid fluorinated hydrocarbon solution is sprayed on the hydrated gelatin.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein the hydrated gelatin is immersed in a mixture of alcohol and liquid fluorinated hydrocarbon.
Claim 5
Dependent Claim
19 words
The method of claim 1 further including the step of drying the mixture of alcohol and liquid fluorinated hydrocarbon.
Claim 6
Dependent Claim
17 words
The method of claim 1 further including agitation of the mixture of alcohol and liquid fluorinated Hydrocarbon.
Claim 7
Dependent Claim
23 words
The method of claim 1 wherein the ratio of fluorinated hydrocarbon to alcohol is within the range of about 6:1 to about 1:3.
Claim 8
Dependent Claim
58 words
In a method of manufacturing optical elements from holographically recorded interference patterns in a dichromated gelatin comprising, the steps of: developing the hologram pattern by hydration; dehydrating the hydrated hologram gelatin by contacting the hydrated gelatin with a mixture of alcohol and a liquid fluorinated hydrocarbon solution, and stabilizing the dehydrated hologram pattern in the gelatin by baking.
Claim 9
Dependent Claim
58 words
In a method of manufacturing optical elements from holographically recorded interference patterns in a dichromated gelatin comprising, the steps of: developing the hologram pattern by hydration; dehydrating the hydrated hologram gelatin by contacting the hydrated gelatin with a mixture of alcohol and a liquid fluorinated hydrocarbon solution, and stabilizing the dehydrated hologram pattern in the gelatin by baking.
Claim 10
Dependent Claim
23 words
The method of claim 7 wherein the dehydration is accomplished by spraying the alcohol and liquid fluorinated hydrocarbon solution on the hydrated gelatin.
Claim 11
Dependent Claim
16 words
The method of claim 7 wherein the dehydration is accomplished by immersion of the hydrated gelatin.
Claim 12
Dependent Claim
23 words
The method of claim 7 wherein the ratio of fluorinated hydrocarbon to alcohol is within the range of about 6:1 to about 1:3.
Claim 13
Dependent Claim
53 words
In a method of developing a holographically recorded interference pattern in a dichromated gelatin that has been initially subjected to a hydration bath and will be subsequently stabilized, the improvement of dehydration, comprising: contacting the hydrated gelatin with a mixture of alcohol and an inert anhydrous liquid solution to dehydrate the dichromated gelatin.
Claim 14
Dependent Claim
53 words
In a method of developing a holographically recorded interference pattern in a dichromated gelatin that has been initially subjected to a hydration bath and will be subsequently stabilized, the improvement of dehydration, comprising: contacting the hydrated gelatin with a mixture of alcohol and an inert anhydrous liquid solution to dehydrate the dichromated gelatin.
Claim 15
Dependent Claim
21 words
The method of claim 11 wherein the mixture of alcohol and the inert anhydrous solution is sprayed on the hydrated gelatin.
Claim 16
Dependent Claim
21 words
The method of claim 11 wherein the hydrated gelatin is immersed in a mixture of alcohol and the inert anhydrous solution.
Claim 17
Dependent Claim
20 words
The method of claim 11 further including the step of drying the mixture of alcohol and the inert anhydrous solution.
Claim 18
Dependent Claim
31 words
The method of claim 11 wherein the inert anhydrous liquid is fluorinated hydrocarbon and the ratio of fluorinated hydrocarbon to alcohol is, within the range of about 6:1 to about 1:3.
Claim 19
Dependent Claim
66 words
In a method of developing a recorded pattern in a dichromated gelatin that has been initially subjected to a hydration bath and will be subsequently stabilized, the improvement of dehydration, comprising: contacting the hydrated gelatin with a plurality of baths which include alcohol and, at least the last one of the baths includes a liquid fluorinated hydrocarbon all in a solution to dehydrate the dichromated gelatin.
Claim 20
Dependent Claim
66 words
In a method of developing a recorded pattern in a dichromated gelatin that has been initially subjected to a hydration bath and will be subsequently stabilized, the improvement of dehydration, comprising: contacting the hydrated gelatin with a plurality of baths which include alcohol and, at least the last one of the baths includes a liquid fluorinated hydrocarbon all in a solution to dehydrate the dichromated gelatin.
Claim 21
Dependent Claim
21 words
The method of claim 16 wherein all of the plurality of baths include a mixture of alcohol and liquid fluorinated hydrocarbon.
Claim 22
Dependent Claim
23 words
The method of claim 16 wherein the ratio of fluorinated hydrocarbon to alcohol is within the range of about 6:1 to about 1:3.
Claim 23
Dependent Claim
22 words
The method of claim 16 wherein the last one of the baths is at or about the boiling temperature of the solution.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |