Patent US4032338A successfully refreshed from Google Patents.
US4032338A
Expired / Lapsed
US
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Holographic recording medium employing a photoconductive layer and a low molecular weight microcrystalline polymeric layer
Assignee: RCA Corp
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Filing: 1975-10-08
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Granted: 1977-06-28
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Expires: 1995-10-08
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
2026-10-31 08:18
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/022
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
69 words
In 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 and an electrically alterable storage layer, the improvement which comprises employing as the electrically alterable layer a layer consisting essentially of a linear, microcrystalline hydrocarbon polymer having a molecular weight in the range from about 300 to about 2000.
Claim 2
Dependent Claim
69 words
In 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 and an electrically alterable storage layer, the improvement which comprises employing as the electrically alterable layer a 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
13 words
A recording medium according to claim 1 wherein the conductive substrate is transparent.
Claim 4
Dependent Claim
13 words
A recording medium according to claim 1 wherein the photoconductive layer is poly-N-vinylcarbazole.
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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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |