Patent US4179532A successfully refreshed from Google Patents.
US4179532A
Expired / Lapsed
US
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Process for producing a disc-shaped information carrier which has information in the form of a beam-reflecting structure
Assignee: Polygram GmbH
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Filing: 1978-04-17
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Granted: 1979-12-18
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Expires: 1998-04-17
Abstract
Abstract A disc-shaped information carrier for high-density storage, in particular for video signals, has the information provided on both sides of the carrier and stored in the form of a beam-relfecting surface structure which is covered by a layer of translucent material. A disc-shaped base element is formed by injection molding, pressing, stamping or the like to exhibit a surface structure corresponding to the information to be stored on both sides thereof. Each side has a thin metallic coating applied thereto which maintains the same surface profile and the information structure is protected on each side with a layer of transparent material.
Inventors
- 👤 Horst Soeding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:08
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
68 words
A process for producing an information carrier, comprising the steps of: embossing opposite lacquer portions of a base element with respective surface profiles corresponding to information to be stored; exposing the embossed lacquer portions to radiant energy to set the profiles; applying metallic layers over the profiled surfaces while maintaining the same profile structures on the outer metallic surfaces; and applying transparent protective coatings over the metallic layers.
Claim 2
Dependent Claim
68 words
A process for producing an information carrier, comprising the steps of: embossing opposite lacquer portions of a base element with respective surface profiles corresponding to information to be stored; exposing the embossed lacquer portions to radiant energy to set the profiles; applying metallic layers over the profiled surfaces while maintaining the same profile structures on the outer metallic surfaces; and applying transparent protective coatings over the metallic layers.
Claim 3
Dependent Claim
21 words
The process of claim 1, wherein the step of exposing is further defined as: irradiating the lacquer portions with ultraviolet light.
Claim 4
Dependent Claim
33 words
The process of claim 1, and further comprising the step of: prior to embossing, applying lacquer layers on respective sides of a transparent base plate to form the lacquer portions of base element.
Claim 5
Dependent Claim
40 words
The process of claim 3, wherein the step of exposing is further defined as: irradiating both lacquer layers from the same side with the more distant lacquer layer being irradiated through the closer lacquer layer and the transparent base plate.
Claim 6
Dependent Claim
34 words
The process of claim 1, and further comprising the step of: prior to embossing, applying lacquer layers on respective sides of an opaque base plate to form the lacquer portions of the base element.
Claim 7
Dependent Claim
25 words
The process of claim 5, wherein the step of exposing is further defined as: irradiating the lacquer layers from respective sides of the base element.
Claim 8
Dependent Claim
28 words
The process of claim 5, wherein the step of applying lacquer layers is further defined as: applying lacquer layers on respective sides of an opaque aluminum base plate.
Claim 9
Dependent Claim
81 words
A process for producing an information carrier, comprising the steps of: forming surface profiles on opposite surface portions of a base element to define the information to be stored; irradiating the profiled surface portions with ultraviolet light to harden the profiled surface portions; applying a beam-reflecting profiled metallic layer on each of the surface profiles while maintaining the same profiles on the outer surfaces of the metallic layers; and applying transparent protective coatings over the profiled surfaces of the metallic layers.
Claim 10
Dependent Claim
81 words
A process for producing an information carrier, comprising the steps of: forming surface profiles on opposite surface portions of a base element to define the information to be stored; irradiating the profiled surface portions with ultraviolet light to harden the profiled surface portions; applying a beam-reflecting profiled metallic layer on each of the surface profiles while maintaining the same profiles on the outer surfaces of the metallic layers; and applying transparent protective coatings over the profiled surfaces of the metallic layers.
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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) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |