Patent US4587166A successfully refreshed from Google Patents.
US4587166A
Expired / Lapsed
US
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Plated magnetic recording material and process for making same
Assignee: Ampex Corp
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Filing: 1983-02-16
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Granted: 1986-05-06
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Expires: 2003-02-16
Abstract
Abstract Plated magnetic recording material, such as magnetic tape, composed of a thin layer of ferromagnetic metal and a base film layer are made by plating a passivated smooth continuous surface such as the surface of a cylindrical mandrel or an endless belt with a plate of ferromagnetic metal, applying the base film layer to the plated surface, and stripping the resulting laminated composite from the surface. The smoothness of the surface of the ferromagnetic metal layer depends on the smoothness of the continuous surface rather than on the smoothness of the surface of the base film stock.
Inventors
- 👤 Marvin C. Garrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:47
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/84; G11B5/858; G11B5/74; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
87 words
Continuous process for making a plated magnetic recording material in the form of a continuous length laminated composite film comprising: (a) plating a passivated smooth continuous length surface with a continuous film of ferromagnetic metal having a thickness in the range of 0.05 to 10 microns; (b) applying a nonmagnetic base film to the plated continuous surface to form said laminated composite composed of said continuous film of ferromagnetic material secured directly to said nonmagnetic base film; and (c) stripping the laminated composite from the continuous surface.
Claim 2
Dependent Claim
87 words
Continuous process for making a plated magnetic recording material in the form of a continuous length laminated composite film comprising: (a) plating a passivated smooth continuous length surface with a continuous film of ferromagnetic metal having a thickness in the range of 0.05 to 10 microns; (b) applying a nonmagnetic base film to the plated continuous surface to form said laminated composite composed of said continuous film of ferromagnetic material secured directly to said nonmagnetic base film; and (c) stripping the laminated composite from the continuous surface.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the continuous surface is defined by a cylindrical mandrel.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the continuous surface is defined by an endless belt.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the surface roughness of the continuous surface is ≦0.10 μm.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein the base film is polymeric and is applied to the plated continuous surface as a preformed web.
Claim 7
Dependent Claim
25 words
The process of claim 5 wherein the side of the web that is applied to the plated continuous surface is coated with an adhesive material.
Claim 8
Dependent Claim
52 words
The process of claim 1 wherein the continuous surface is defined by an endless belt, the base film is applied to the plated continuous surface in the form of a curable resin coating and the laminated composite is subjected to a curing step before the composite is stripped from the continuous surface.
Claim 9
Dependent Claim
77 words
A plated magnetic recording medium comprising a continuous length laminated composite film of: (a) a nonmagnetic base film layer; and (b) a thin plate of a continuous film of ferromagnetic metal having a thickness in the range of 0.05 and 10 microns secured directly to one side of the base film layer, the surface contour of which is substantially independent of the surface contour of the side of the base film to which the plate is secured.
Claim 10
Dependent Claim
77 words
A plated magnetic recording medium comprising a continuous length laminated composite film of: (a) a nonmagnetic base film layer; and (b) a thin plate of a continuous film of ferromagnetic metal having a thickness in the range of 0.05 and 10 microns secured directly to one side of the base film layer, the surface contour of which is substantially independent of the surface contour of the side of the base film to which the plate is secured.
Claim 11
Dependent Claim
12 words
A plated magnetic recording material made by the process of claim 1.
Claim 12
Dependent Claim
20 words
The process of claim 7 wherein the base film is applied to the plated continuous surface in doctor blade fashion.
Claim 13
Dependent Claim
26 words
The process of claim 1 wherein the laminated composite is stripped from the continuous surface by taking the laminated composite up on a take up roll.
Claim 14
Dependent Claim
19 words
The process of claim 1 wherein the laminated composite film is useful as a high density video recording tape.
Claim 15
Dependent Claim
19 words
The plated magnetic recording medium of claim 8 wherein the medium is useful as high density video recording tape.
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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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |