Patent US4402798A successfully refreshed from Google Patents.
US4402798A
Expired / Lapsed
US
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Method for the manufacture of a metallic recording substrate for a capacitance electronic disc and the recording substrate obtained thereby
Assignee: RCA Corp
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Filing: 1982-02-16
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Granted: 1983-09-06
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Expires: 2002-02-16
Abstract
Abstract In accordance with the present disclosure recorded metallic recording substrates made of a relatively soft metal are coated with a conformal 200 to 400 angstroms thick layer of chromium, chromium oxide, or a mixture thereof, and then preferably passivated prior to being used as matrixes in the replication process.
Inventors
- 👤 Istvan Gorog
- 👤 Leonard P. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:56
CPC Classifications
C; C25; C25D; C25D1/00; C25D1/10; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
128 words
In the method for manufacture of a capacitance electronic disc wherein a recording substrate having a metal layer on a surface thereof is recorded in said metal layer with an information track containing video and audio signal information and said recording substrate is thereafter used as a matrix on which to electroform masters for said capacitance electronic discs, the improvement which comprises non-electrolytically applying an about 200 to about 400 angstroms thick continuous adherent conformal layer of a material selected from the group consisting of chromium, chromium oxide and a mixture thereof to the recorded metal surface prior to electroforming a master thereon, thereby reducing the losses in carrier-to-noise ratio of the video and audio signal information as a result of replication of masters on the recording substrate.
Claim 2
Dependent Claim
128 words
In the method for manufacture of a capacitance electronic disc wherein a recording substrate having a metal layer on a surface thereof is recorded in said metal layer with an information track containing video and audio signal information and said recording substrate is thereafter used as a matrix on which to electroform masters for said capacitance electronic discs, the improvement which comprises non-electrolytically applying an about 200 to about 400 angstroms thick continuous adherent conformal layer of a material selected from the group consisting of chromium, chromium oxide and a mixture thereof to the recorded metal surface prior to electroforming a master thereon, thereby reducing the losses in carrier-to-noise ratio of the video and audio signal information as a result of replication of masters on the recording substrate.
Claim 3
Dependent Claim
20 words
The method according to claim 1 wherein the metal layer into which the information track recorded is comprised of copper.
Claim 4
Dependent Claim
21 words
The method according to claim 1 wherein the surface of the conformal layer is passivated prior to use as a matrix.
Claim 5
Dependent Claim
30 words
The method according to claim 3 wherein a plurality of masters are electroformed on the recording substrate and said surface of the conformal layer is passivated prior to each replication.
Claim 6
Dependent Claim
17 words
The method according to claim 1 wherein the conformal layer is sputtered on the recorded metal layer.
Claim 7
Dependent Claim
70 words
A recording substrate for use in the manufacture of capacitance electronic discs comprising in combination a metal layer having recorded in a surface thereof an information track containing video and audio signal information and an about 200 to 400 angstroms thick non-electrolytically deposited continuous adherent conformal layer of a material selected from the group consisting of chromium, chromium oxide and mixtures thereof formed on the surface of said metal layer.
Claim 8
Dependent Claim
70 words
A recording substrate for use in the manufacture of capacitance electronic discs comprising in combination a metal layer having recorded in a surface thereof an information track containing video and audio signal information and an about 200 to 400 angstroms thick non-electrolytically deposited continuous adherent conformal layer of a material selected from the group consisting of chromium, chromium oxide and mixtures thereof formed on the surface of said metal layer.
Claim 9
Dependent Claim
15 words
The recording substrate according to claim 6 wherein the metal layer is comprised of copper.
Claim 10
Dependent Claim
16 words
The recording substrate according to claim 6 wherein the surface of the conformal layer is passivated.
Claim 11
Dependent Claim
16 words
The method according to claim 1 wherein the conformal layer is applied by chemical vapor deposition.
Claim 12
Dependent Claim
15 words
The method according to claim 1 wherein the conformal layer is applied by vacuum deposition.
Claim 13
Dependent Claim
131 words
In the method for manufacture of a capacitance electronic disc wherein a recording substrate having a copper layer on a surface thereof is recorded in said copper layer with an information track containing video and audio signal information and said recording substrate is thereafter used as a matrix on which to electroform a master for said capacitance electronic disc, the improvement which comprises sputtering an about 200 to about 400 angstroms thick substantial pin hole free adherent conformal layer of a material selected from the group consisting of chromium, chromium oxide and a mixture thereof to the recorded metal surface prior to electroforming a master thereon, thereby reducing the losses in carrier-to-noise ratio of the video and audio signal information as a result of replication of masters on the recording substrate.
Claim 14
Dependent Claim
131 words
In the method for manufacture of a capacitance electronic disc wherein a recording substrate having a copper layer on a surface thereof is recorded in said copper layer with an information track containing video and audio signal information and said recording substrate is thereafter used as a matrix on which to electroform a master for said capacitance electronic disc, the improvement which comprises sputtering an about 200 to about 400 angstroms thick substantial pin hole free adherent conformal layer of a material selected from the group consisting of chromium, chromium oxide and a mixture thereof to the recorded metal surface prior to electroforming a master thereon, thereby reducing the losses in carrier-to-noise ratio of the video and audio signal information as a result of replication of masters on the recording substrate.
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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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |