US4927716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment for recording media
Assignee: Imperial Chemical Industries Ltd
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Filing: 1987-08-13
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Granted: 1990-05-22
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Expires: 2007-08-13
Abstract
Abstract A method for improving the abrasion resistance of an electroless plated ferromagnetic recording layer of a video tape comprises applying a solution of a long chain organic perioxide, e.g. lauroyl peroxide, to the surface.
Inventors
- 👤 Terence Goulding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:31
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/68; G11B5/70; G11B5/712; G11B5/725; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
A method for treating the surface of an electroless plated ferromagnetic recording layer to enhance its abrasion resistance, which comprises applying to the surface a dilute solution comprising 0.1 to 1% by weight of organic peroxide having carbon chains containing 8-20 carbon atoms in the absence of any organic material polymerisable by the peroxide solution.
Claim 2
Independent Claim
55 words
A method for treating the surface of an electroless plated ferromagnetic recording layer to enhance its abrasion resistance, which comprises applying to the surface a dilute solution comprising 0.1 to 1% by weight of organic peroxide having carbon chains containing 8-20 carbon atoms in the absence of any organic material polymerisable by the peroxide solution.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1 wherein the organic peroxide comprises linear aliphatic groups containing at least 10 carbon atoms.
Claim 4
Dependent Claim
14 words
A method as claimed in claim 2 wherein the organic peroxide is lauroyl peroxide.
Claim 5
Dependent Claim
27 words
A method as claimed in claim 1 wherein the peroxide is applied as a thin layer and allowed or caused to dry by evaporation of the solvent.
Claim 6
Dependent Claim
40 words
A method as claim 1 wherein the ferromagnetic layer and its applied organic peroxide are heated to a temperature above the melting temperature of the organic peroxide, but below that which would cause damage to materials supporting the recording layer.
Claim 7
Dependent Claim
52 words
A method as claimed in claim 1 wherein the layer of electroless plated ferromagnetic material is treated with hydrogen peroxide in addition to the organic peroxide, the treatments being carried out simultaneously or sequentially, the hydrogen peroxide treatment being terminated prior to the onset of any noticeable disintegration of the recording layer.
Claim 8
Dependent Claim
21 words
A method as claimed in claim 6, wherein the treatment with hydrogen peroxide is carried out before applying the organic peroxide.
Claim 9
Dependent Claim
27 words
A method as claimed in claim 1 in which the ferromagnetic material is essentially cobalt, an alloy of cobalt or a mixture of cobalt with another metal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |