US4012253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic recording medium
Assignee: RCA Corp
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Filing: 1974-10-16
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Granted: 1977-03-15
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Expires: 1994-10-16
Abstract
Abstract A holographic recording medium comprising a conductive substrate, a photoconductive layer and an electrically alterable layer of a linear, low molecular weight hydrocarbon polymer has improved fatigue resistance. An acrylic barrier layer can be interposed between the photoconductive and electrically alterable layers.
Inventors
- 👤 Robert Allen Gange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:55
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/022; G03G5/14; G03G5/142
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
A medium for recording and erasing phase holograms in the form of a surface relief pattern consisting essentially of in sequence an electrically conductive substrate, a photoconductive insulating layer, a transparent, polar, barrier layer, and an electrically alterable storage layer consisting essentially of a linear, microcrystalline hydrocarbon polymer having a molecular weight in the range from about 300 to about 2000.
Claim 2
Independent Claim
61 words
A medium for recording and erasing phase holograms in the form of a surface relief pattern consisting essentially of in sequence an electrically conductive substrate, a photoconductive insulating layer, a transparent, polar, barrier layer, and an electrically alterable storage layer consisting essentially of a linear, microcrystalline hydrocarbon polymer having a molecular weight in the range from about 300 to about 2000.
Claim 3
Dependent Claim
24 words
A medium according to claim 1 wherein the barrier layer is a layer of an acrylic resin up to about 0.25 micron in thickness.
Claim 4
Dependent Claim
35 words
A medium according to claim 1 wherein the barrier layer is a layer of a methyl/n-butyl-methacrylate copolymer having an inherent viscosity of 0.2 and the barrier layer is up to about 0.25 micron in thickness.
References Cited (Backward Citations)
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Cited
US3243293A
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US3565612A
Cited
US3598581A
Cited
US3723112A
Cited
US3640708A
Cited
US3741759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |