US3655441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroless plating of filamentary magnetic records
Assignee: Honeywell Inc
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Filing: 1966-08-22
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Granted: 1972-04-11
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Expires: 1986-08-22
Abstract
Abstract A magnetic record having a non-magnetic substrate carrying information-storing tracks of magnetic material has a gelatinous material coating the substrate and particulate silver metal secured on the gelatinous material in accordance with the pattern of the recording tracks. The silver is provided in this pattern by coating the gelatinous material with a photographic emulsion that is subsequently exposed and developed according to the desired pattern of recording tracks.
Inventors
- 👤 John H Kefalas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:39
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/855; H; H01; H01F; H01F10/00; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24521; Y10T428/24537; Y10T428/24545; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31685; Y10T428/31786
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
17 words
includes plural strips separated from each other by a second dimension markedly less that said first dimension.
Claim 2
Dependent Claim
43 words
A record as defined in claim 1 in which each said strip comprises at least two layers of said magnetic recording material separated by a layer of non-magnetic material and wherein said layers of each strip are substantially in register with each other.
Claim 3
Dependent Claim
37 words
A magnetic record as defined in claim 1 further comprising a non-magnetic material disposed intermediate said strips and said tracks and having a thickness sufficient to form lands upstanding on said record further than said recording material.
Claim 4
Dependent Claim
122 words
A magnetic record having a nonmagnetic substrate carrying information-storing tracks of magnetic material with the tracks arranged according to first pattern, and characterized by the improvement wherein A. gelatinous material coats said substrate intermediate said substrate and said recording material, B. particulate silver metal is secured on said gelatinous material in accordance with said first pattern, C. each said recording track includes at least one strip of said information-storing material, said strip having a width sufficiently narrow so that said magnetic recording material has a magnetic shape anisotropy with a preferred direction of magnetization transverse to said strip width and directed along said strip, and D. relatively nonmagnetic material separates said strips from each other in the direction of said strip width.
Claim 5
Dependent Claim
14 words
A magnetic record as defined in claim 4 in which each said recording track
Claim 6
Dependent Claim
115 words
A magnetic record having a nonmagnetic substrate carrying information-storing tracks of magnetic recording material, and characterized by the improvement wherein A. said tracks are arranged in a first pattern in which they extend in the same direction on said record and are spaced from one another transverse to said direction of extension, B. gelatinous material coats said substrate substantially continuously intermediate said substrate and said recording material, C. metallic plating-nuclei particles are seeded onto said gelatinous material in said first pattern only, D. said recording material overlies said seeded gelatinous material, to be contiguous therewith in said first pattern only, and E. the spaces between said tracks of recording material are devoid of magnetic material.
Claim 7
Dependent Claim
56 words
A magnetic record as defined in claim 6 in which said first pattern is so configured that each said recording track consists of plural separate, spaced-apart strips extending in the same direction as said track and the spaces between said strips are devoid of magnetic material and are considerably narrower than the spaces between said tracks.
Claim 8
Dependent Claim
65 words
A magnetic record as defined in claim 6 in which said recording material is arranged in at least two separate, spaced-apart and in-register layers in each said track and further comprising a layer of nonmagnetic material between said two layers of magnetic recording material, with said layer of nonmagnetic material having sufficient thickness to preclude significant magnetic coupling between said two layers of recording material.
Claim 9
Dependent Claim
42 words
A magnetic record as defined in claim 6 further comprising lands of developed photographic material intermediate adjacent recording tracks and protruding from said substrate to above said magnetic material of said recording tracks, so that said tracks are recessed below said lands.
Claim 10
Independent Claim
146 words
A method of making a magnetic record having tracks of information storing magnetic material on a nonmagnetic substrate, said method comprising the successive steps of A. providing a multi-layer nonmagnetic substrate having a nonmagnetic base layer, a layer of gelatinous material covering said base layer, and a layer of photosensitive photographic material covering said gelatinous layer, B. photographically exposing and developing said photographic material on said substrate selectively to remove said photographic material, and thereby expose said gelatinous material, in only a first surface pattern that defines said tracks extending along said record and spaced from each other by nonmagnetic material, and to provide developed photosensitive material on the rest of the surface of said substrate, and C. electrolessly plating said information-storing material on only said exposed gelatinous material of said substrate, thereby to provide said tracks with said magnetic material in only said first pattern.
Claim 11
Dependent Claim
44 words
The method defined in claim 10 in which said plating step includes a preliminary step of sensitizing said exposed gelatinous material in said first pattern with metallic plating-nuclei particles and thereafter subjecting said sensitized substrate to an electrolyte for electrolessly depositing said magnetic material.
Claim 12
Dependent Claim
26 words
The method defined in claim 10 in which said exposing and developing steps leave on said substrate upstanding lands of developed photosensitive material intermediate said tracks.
Claim 13
Dependent Claim
66 words
The method defined in claim 10 in which said exposing and developing steps remove said photographic material in accordance with a first pattern that forms said tracks extending in the same direction along said record and spaced-apart transverse to said direction of extension and further forms each said tracks with plural narrow strips closely spaced apart to be separate from other strips of the same track.
Claim 14
Dependent Claim
77 words
The method defined in claim 13 in which said exposing and developing steps are further characterized as removing said photographic material in accordance with a first pattern that defines each said strip to have a width sufficiently narrow so that said magnetic recording material deposited therein has a magnetic shape anisotropy with a preferred direction of magnetization longitudinal to said strip, and in which said plating step provides said magnetic recording material only in said track-forming strips.
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |