US3928108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a poly(methyl methacrylate) pre-holographic element
Assignee: United States Department of the Navy
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Filing: 1974-08-12
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Granted: 1975-12-23
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Expires: 1994-08-12
Abstract
Abstract Methods for manufacturing pre-holographic elements are disclosed. The methods comprise the steps of providing a poly(methyl methacrylate) base, coating the base with a nitrocellulose-containing coating composition, denitrating the coating composition, covering the coated base with water, placing a pre-hardened gelatin film under the water near the coating on the base and removing the water from between the coating and the pre-hardened gelatin film.
Inventors
- 👤 Arnold Adicoff
- 👤 Warren J Murbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:25
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/30; B32B27/308; G; G03; G03C; G03C1/00; G03C1/66; G03C1/76; G03C1/91; G03C1/93; G03H; G03H1/00; G03H1/02; B32B2255/00; B32B2255/10; B32B2255/24; G03H1/04; G03H1/0402; G03H2001/043; G03H2250/00; G03H2250/39; G03H2260/00; G03H2260/10; G03H2270/00; G03H2270/10; G03H2270/14; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31779; Y10T428/31783
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A METHOD FOR MANUFACTURING A PRE-HOLOGRAPHIC ELEMENT COMPRISING THE STEPS OF: A. PROVIDING A POLY (METHYL METHACRYLATE) BASE; B. COATING THE BASE WITH A COATING COMPOSITION MADE UP OF 2 WEIGHT PERCENT NITROCELLULOSE AND 98 WEIGHT PERCENT 2-METHOXYETHANOL; C. DRYING THE COATING D. DENITRATING THE COATING BY IMMERSING IT IN A STIRRED BATH OF A DENITRATING COMPOSITION MADE UP OF 50 VOLUME PERCENT AMMONIUM SULFIDE AND 50 VOLUME PERCENT ETHANOL FOR 1 HOUR TO FORM REGENERATED CELLULOSE; E. COVERING THE COATED BASE WITH WATER; F. PLACING A PRE-HARDENED GELATIN FILM UNDER THE WATER NEAR THE COATED BASE; AND G. REMOVING THE WATER FROM BETWEEN THE COATED BASE AND THE GELATIN FILM ALLOWING THE GELATIN FILM TO CONTACT THE COATING.
Claim 2
Independent Claim
119 words
A METHOD FOR MANUFACTURING A PRE-HOLOGRAPHIC ELEMENT COMPRISING THE STEPS OF: A. PROVIDING A POLY (METHYL METHACRYLATE) BASE; B. COATING THE BASE WITH A COATING COMPOSITION MADE UP OF 2 WEIGHT PERCENT NITROCELLULOSE AND 98 WEIGHT PERCENT 2-METHOXYETHANOL; C. DRYING THE COATING D. DENITRATING THE COATING BY IMMERSING IT IN A STIRRED BATH OF A DENITRATING COMPOSITION MADE UP OF 50 VOLUME PERCENT AMMONIUM SULFIDE AND 50 VOLUME PERCENT ETHANOL FOR 1 HOUR TO FORM REGENERATED CELLULOSE; E. COVERING THE COATED BASE WITH WATER; F. PLACING A PRE-HARDENED GELATIN FILM UNDER THE WATER NEAR THE COATED BASE; AND G. REMOVING THE WATER FROM BETWEEN THE COATED BASE AND THE GELATIN FILM ALLOWING THE GELATIN FILM TO CONTACT THE COATING.
Claim 3
Dependent Claim
22 words
The method according to claim 1 wherein the coating is dried for at least 4 hours before the denitrating step is performed.
Claim 4
Dependent Claim
18 words
the method according to claim 2 wherein the denitrating step is carried out for at least 1 hour.
Claim 5
Dependent Claim
30 words
the method according to claim 3 wherein the base is selected from the group consisting of poly(methyl methacrylate) objects having spheroidal surfaces and poly (methyl methacrylate) objects having toroidal surfaces.
Claim 6
Dependent Claim
22 words
The method according to claim 3 wherein the base is selected from the group consisting of polymethyl methacrylate) objects having flat surfaces.
References Cited (Backward Citations)
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Cited
US2471583A
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US2606130A
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US3178287A
Cited
US3402087A
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US3833383A
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |