US4148636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadening the spatial frequency pass band of a thermoplastic layer
Assignee: RCA Licensing Corp
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Filing: 1978-08-29
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Granted: 1979-04-10
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Expires: 1998-08-29
Abstract
Abstract A layer of thermally deformable plastic used, for example, in a holographic recording medium has an undulated surface whereby the layer has an uneven thickness. Because of the uneven thickness, the layer has a composite spatial frequency pass band greater than the spatial frequency pass band of a layer of uniform thickness.
Inventors
- 👤 Thomas L. Credelle
- 👤 William J. Hannan
- 👤 Fred W. Spong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:38
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03G; G03G16/00; G03H2260/00; G03H2260/50; G03H2260/53; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24612
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
In the method of recording a hologram of an image in a medium wherein an electrically conductive layer has first and second surfaces connected to one surface of a photoconductor layer and a surface of a substrate, respectively, the steps of: providing a thermoplastic layer of substantially uneven thickness that causes said thermoplastic layer to have a multiplicity of frost frequencies; disposing said thermoplastic layer upon the other surface of said photoconductor layer, whereby said photoconductor layer is between said conductive layer and said thermoplastic layer and said thermoplastic layer has a surface abutting said photoconductor layer and a free surface; maintaining a uniform voltage between said conductive layer and said free surface, thereby providing a charged assembly; providing an interference pattern of light representative of said image to said photoconductor layer in said charged assembly; and applying heat to said charged assembly.
Claim 2
Dependent Claim
143 words
In the method of recording a hologram of an image in a medium wherein an electrically conductive layer has first and second surfaces connected to one surface of a photoconductor layer and a surface of a substrate, respectively, the steps of: providing a thermoplastic layer of substantially uneven thickness that causes said thermoplastic layer to have a multiplicity of frost frequencies; disposing said thermoplastic layer upon the other surface of said photoconductor layer, whereby said photoconductor layer is between said conductive layer and said thermoplastic layer and said thermoplastic layer has a surface abutting said photoconductor layer and a free surface; maintaining a uniform voltage between said conductive layer and said free surface, thereby providing a charged assembly; providing an interference pattern of light representative of said image to said photoconductor layer in said charged assembly; and applying heat to said charged assembly.
Claim 3
Dependent Claim
40 words
The method of claim 1 wherein said step of providing said thermoplastic layer includes the step of providing said thermoplastic layer with a multiplicity of frost frequencies within a range of 733 cycles per millimeter to 1,250 cycles per millimeter.
Claim 4
Dependent Claim
105 words
In the method of recording a hologram of an image in a medium wherein one surface of an electrically conductive layer has one surface connected to a substrate, the steps of: providing a photoplastic layer of substantially uneven thickness that causes said photoplastic layer to have a multiplicity of frost frequencies; disposing said photoplastic layer upon the other surface of said conductive layer; maintaining a uniform voltage between said conductive layer and said free surface, thereby providing a charged assembly; providing an interference pattern of light representative of said image to said photoplastic layer in said charged assembly; and applying heat to said charged assembly.
Claim 5
Dependent Claim
105 words
In the method of recording a hologram of an image in a medium wherein one surface of an electrically conductive layer has one surface connected to a substrate, the steps of: providing a photoplastic layer of substantially uneven thickness that causes said photoplastic layer to have a multiplicity of frost frequencies; disposing said photoplastic layer upon the other surface of said conductive layer; maintaining a uniform voltage between said conductive layer and said free surface, thereby providing a charged assembly; providing an interference pattern of light representative of said image to said photoplastic layer in said charged assembly; and applying heat to said charged assembly.
Claim 6
Dependent Claim
40 words
The method of claim 3 wherein said step of providing said photoplastic layer includes the step of providing said photoplastic layer with a multiplicity of frost frequencies within a range from 733 cycles per millimeter to 1,250 cycles per millimeter.
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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) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |