US4826290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing stable holograms in dichromatic gelatin
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1987-09-21
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Granted: 1989-05-02
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Expires: 2007-09-21
Abstract
Abstract A method of developing a holographically recorded interference pattern in a dichromatic gelatin structure is provided. The process includes developing the hologram pattern by hydration and dehydration, baking the developed hologram pattern at a temperature equal or above 120° C. for approximately 24 hours, rehydrating the developed hologram and dehydrating the developed hologram at a temperature of approximately 60° C. for approximately 48 hours until the design wavelength response is attained to provide a stabilized hologram.
Inventors
- 👤 John E. Wreede
- 👤 James E. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:42
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03C; G03C5/00; G03C5/22; G03H2001/026; G03H2260/00; G03H2260/10; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
79 words
A method of developing a holographically recorded interference pattern in a dichromated gelatin and the like, comprising the steps of: developing the hologram pattern in the dichromated gelatin by contact with predetermined liquids, heating the developed hologram pattern after removal from the liquids; redeveloping of the heated hologram pattern by contact with predetermined liquids, and reheating the redeveloped hologram pattern until a predetermined wavelength response is achieved whereby a stabilized hologram is produced in a relatively short time period.
Claim 2
Independent Claim
79 words
A method of developing a holographically recorded interference pattern in a dichromated gelatin and the like, comprising the steps of: developing the hologram pattern in the dichromated gelatin by contact with predetermined liquids, heating the developed hologram pattern after removal from the liquids; redeveloping of the heated hologram pattern by contact with predetermined liquids, and reheating the redeveloped hologram pattern until a predetermined wavelength response is achieved whereby a stabilized hologram is produced in a relatively short time period.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the hologram pattern is developed in a series of hydration and dehydration baths.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein the hydration and dehydration include deionized water and alcohol baths.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein the developed hologram pattern is heated to a temperature above the softening temperature of the dichromated gelatin for approximately 24 hours.
Claim 6
Dependent Claim
25 words
The method of claim 4 wherein the hologram pattern is reheated for stabilization at a temperature less than the softening temperature for approximately 48 hours.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the hologram pattern is redeveloped in a series of hydration and dehydration baths.
Claim 8
Dependent Claim
17 words
The method of claim 1 wherein the redeveloping is performed at a temperature of about 65° C.
Claim 9
Dependent Claim
24 words
The method of claim 1 wherein the developed hologram pattern is heated to a temperature above about 120° C. and less than 150° C.
Claim 10
Independent Claim
99 words
A method of developing a holographically recorded interference pattern in a dichromated gelatin comprising the steps of: developing the hologram pattern by hydration and dehydration of the dichromated gelatin; initially baking the developed hologram pattern at a temperature above the softening temperature of the gelatin for an initial time period until a predetermined wavelength response is achieved; redeveloping by hydrating the initially baked hologram; redeveloping by dehydrating the initially baked hologram, and baking the redeveloped hologram a second time at a temperature less than the initial baking temperature until a stable hologram having a desired wavelength response is produced.
Claim 11
Independent Claim
99 words
A method of developing a holographically recorded interference pattern in a dichromated gelatin comprising the steps of: developing the hologram pattern by hydration and dehydration of the dichromated gelatin; initially baking the developed hologram pattern at a temperature above the softening temperature of the gelatin for an initial time period until a predetermined wavelength response is achieved; redeveloping by hydrating the initially baked hologram; redeveloping by dehydrating the initially baked hologram, and baking the redeveloped hologram a second time at a temperature less than the initial baking temperature until a stable hologram having a desired wavelength response is produced.
Claim 12
Dependent Claim
19 words
The method of claim 9 wherein the developed hologram is initially baked at a temperature above about 120° C.
Claim 13
Dependent Claim
22 words
The method of claim 9 wherein the developed hologram pattern is baked between 130° C. to 145° C. for approximately 24 hours.
Claim 14
Dependent Claim
24 words
The method of claim 9 wherein the second hydrating and dehydrating steps were performed at a temperature range of approximately 50° to 70° C.
Claim 15
Dependent Claim
23 words
The method of claim 9 wherein the predetermined wavelength response of the initial baking is above the desired wavelength of the second baking.
Claim 16
Independent Claim
94 words
A method of developing a holographically recorded interference pattern in a dichromated gelatin comprising the steps of: developing the hologram pattern by hydration and dehydration of the dichromated gelatin; initially baking the developed hologram pattern at a temperature above the softening temperature of the gelating until a predetermined wavelength response about a desired wavelength is achieved; redeveloping by hydrating the initially baked hologram; redeveloping by dehydrating the initially baked hologram, and baking the redeveloped halogram a second time at a temperature less than the initial baking temperature until the desired wavelength response is achieved.
Claim 17
Independent Claim
94 words
A method of developing a holographically recorded interference pattern in a dichromated gelatin comprising the steps of: developing the hologram pattern by hydration and dehydration of the dichromated gelatin; initially baking the developed hologram pattern at a temperature above the softening temperature of the gelating until a predetermined wavelength response about a desired wavelength is achieved; redeveloping by hydrating the initially baked hologram; redeveloping by dehydrating the initially baked hologram, and baking the redeveloped halogram a second time at a temperature less than the initial baking temperature until the desired wavelength response is achieved.
Claim 18
Dependent Claim
19 words
The method of claim 14 wherein the hydration and dehydration steps occur at approximately a temperature of 65° C.
Claim 19
Dependent Claim
22 words
The method of claim 14 wherein the second baking time is for a period of approximately 48 hours at approximately 60° C.
Claim 20
Independent Claim
113 words
A method of developing a holographically recorded interference pattern in a dichromated gelatin comprising the steps of: developing the hologram pattern by hydration and dehydration of the dichromated gelatin, at a temperature of approximately 20° C.; baking the developed hologram pattern at a temperature approximately equal to or above 120° C. until a predetermined wavelength response from a design wavelength is achieved; redeveloping by hydrating the baked hologram at a temperature of approximately 60° C.; redeveloping by dehydrating the baked hologram at a temperature of approximately 60° C.; and baking the redeveloped hologram a second time at a temperature of approximately one-half the initial baking temperature until a predetermined wavelength response is achieved.
Claim 21
Independent Claim
113 words
A method of developing a holographically recorded interference pattern in a dichromated gelatin comprising the steps of: developing the hologram pattern by hydration and dehydration of the dichromated gelatin, at a temperature of approximately 20° C.; baking the developed hologram pattern at a temperature approximately equal to or above 120° C. until a predetermined wavelength response from a design wavelength is achieved; redeveloping by hydrating the baked hologram at a temperature of approximately 60° C.; redeveloping by dehydrating the baked hologram at a temperature of approximately 60° C.; and baking the redeveloped hologram a second time at a temperature of approximately one-half the initial baking temperature until a predetermined wavelength response is achieved.
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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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |