Patent US4126726A successfully refreshed from Google Patents.
US4126726A
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Disc-shaped information carrier having information in the form of a beam-reflecting structure and a process for producing the same
Assignee: Polygram GmbH
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Filing: 1977-04-04
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Granted: 1978-11-21
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Expires: 1997-04-04
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-reflecting 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 23:06
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1023; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24521; Y10T428/24537; Y10T428/24545; Y10T428/31
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
69 words
An information carrier for high-density storage, comprising: a base element including a pair of surfaces each having a surface profile structure corresponding to the stored information; a pair of metallic beam reflecting layers each carried on a respective one of said surfaces and having the respective surface profile on the outer metal surfaces; and a pair of transparent layers each carried on a respective one of said metallic layers
Claim 2
Dependent Claim
69 words
An information carrier for high-density storage, comprising: a base element including a pair of surfaces each having a surface profile structure corresponding to the stored information; a pair of metallic beam reflecting layers each carried on a respective one of said surfaces and having the respective surface profile on the outer metal surfaces; and a pair of transparent layers each carried on a respective one of said metallic layers
Claim 3
Dependent Claim
14 words
The information carrier of claim 1, wherein said base element comprises a thermosetting material.
Claim 4
Dependent Claim
48 words
The information carrier of claim 1, wherein said base element comprises: a central layer having a pair of planar surfaces; and a pair of information bearing layers each carried on a respective one of said planar surfaces and each having a respective one of said surface profile structures.
Claim 5
Dependent Claim
13 words
The information carrier of claim 3, wherein said central layer comprises opague material.
Claim 6
Dependent Claim
14 words
The information carrier of claim 3, wherein said central layer comprises an aluminum layer.
Claim 7
Dependent Claim
40 words
The information carrier of claim 1, wherein: each of said metallic layers has a thickness in the range of 300 to 1000 A; and each of said transparent layers has a thickness in the range of 200 to 400 μ.
Claim 8
Dependent Claim
11 words
The information carrier of claim 1, wherein said carrier is disc-shaped.
Claim 9
Dependent Claim
59 words
A process for producing an information carrier comprising the steps of: forming a surface structure on each side of a base element corresponding to information to be stored; applying a metallic coating on each of the sides while maintaining the same surface structure on the outer metal surfaces; and applying a transparent coating over each of the metallic coatings.
Claim 10
Dependent Claim
59 words
A process for producing an information carrier comprising the steps of: forming a surface structure on each side of a base element corresponding to information to be stored; applying a metallic coating on each of the sides while maintaining the same surface structure on the outer metal surfaces; and applying a transparent coating over each of the metallic coatings.
Claim 11
Dependent Claim
26 words
The process of claim 8, wherein the step of applying the metallic coatings is further defined as vapor depositing the metal coatings on the base element.
Claim 12
Dependent Claim
23 words
The process of claim 8, wherein the step of applying the transparent coatings is further defined as covering the metallic coatings with lacquer.
Claim 13
Dependent Claim
65 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; hardening the profiled surface portions; applying a beam-reflecting profiled metallic layer on each of the surface profiles on the outer metal surfaces while maintaining the same profiles; and applying transparent protective coatings over the metallic layers.
Claim 14
Dependent Claim
65 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; hardening the profiled surface portions; applying a beam-reflecting profiled metallic layer on each of the surface profiles on the outer metal surfaces while maintaining the same profiles; and applying transparent protective coatings over the metallic layers.
Claim 15
Dependent Claim
19 words
The process of claim 11, wherein the step of hardening is further defined as: heating the profiled surface portions.
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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) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |