US3954469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of creating a replicating matrix
Assignee: Discovision Associates
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Filing: 1973-10-01
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Granted: 1976-05-04
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Expires: 1993-10-01
Abstract
Abstract A video disc master of glass, having a metal surface with microscopic apertures therein representing information, is coated with a commercial photosensitive resist, the sensitivity of which has been enhanced. The resist is uniformly exposed through the glass disc. The unexposed resist is removed using conventional developers to which a surfectant is added. The resulting disc has surface irregularities of predetermined height which can be alternatively used to product "stampers" for embossing replicas or to produce a mold for casting replicas.
Inventors
- 👤 Norma Abigania Avanzado
- 👤 Manfred H. Jarsen
- 👤 Csaba K. Hunyar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:55
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B7/261; G03; G03F; G03F7/00; G03F7/20; G11B23/00; G11B23/0057; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
The process of producing a replicating matrix from a master disc in which information is represented as a multiplicity of transparent and opaque areas over the surface of a transparent disc, comprising the steps of: 1. fastening the disc to a rotatable spindle with the information bearing surface outermost; 2. rotating the disc; 3. washing the rotating disc with xylene; 4. coating the disc with a premeasured quantity of photoresist to build a desired thickness of photoresist; 5. drying the photoresist coating for approximately 10 minutes; 6. removing the disc from the spindle; 7. baking the photoresist coating at a temperature of approximately 260° F. for approximately 15 minutes, whereby the interim product produced can be exposed and developed into a replicating matrix.
Claim 2
Dependent Claim
123 words
The process of producing a replicating matrix from a master disc in which information is represented as a multiplicity of transparent and opaque areas over the surface of a transparent disc, comprising the steps of: 1. fastening the disc to a rotatable spindle with the information bearing surface outermost; 2. rotating the disc; 3. washing the rotating disc with xylene; 4. coating the disc with a premeasured quantity of photoresist to build a desired thickness of photoresist; 5. drying the photoresist coating for approximately 10 minutes; 6. removing the disc from the spindle; 7. baking the photoresist coating at a temperature of approximately 260° F. for approximately 15 minutes, whereby the interim product produced can be exposed and developed into a replicating matrix.
Claim 3
Dependent Claim
70 words
The process of claim 1, above, further including the steps of: a. exposing the photosensitive material to actinic radiation through the transparent disc and through the pattern of apertures; b. developing the photosensitive material to selectively remove photosensitive material in a pattern corresponding to the pattern of opaque and radiation transmitting surface areas of the substrate body, whereby a three dimensional replicating matrix is formed representing the record video information.
Claim 4
Dependent Claim
65 words
The process of claim 2, above, wherein the developing step comprises the steps of: rotating the disc; applying xylene to the photoresist surface of the rotating disc; mechanically removing xylene near the center of the disc in the non-information representing areas; washing the rotating disc with a mixture of water, isopropanol and detergent; rinsing the disc with water; drying the disc; and baking the disc.
References Cited (Backward Citations)
US3687664A
Cited
US3795534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |