Patent US3607149A successfully refreshed from Google Patents.
US3607149A
Expired / Lapsed
US
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High-temperature magnetic recording tape
Assignee: Dynasciences Corp
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Filing: 1965-11-10
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Granted: 1971-09-21
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Expires: 1985-11-10
Abstract
Abstract This patent describes a high-temperature magnetic recording tape comprising a nonmagnetic substrate, adhered to said substrate an intermediate barrier layer for resisting the diffusion of foreign elements from the substrate, and adhered to said intermediate barrier layer a magnetic coating layer adapted to receive and retain recorded information, said magnetic coating layer being at least 10 Mu inches thicker than the total thickness of all other layers on said substrate.
Inventors
- 👤 James M Rice
- 👤 Irving J Hutkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:37
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/06; G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/925; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12708; Y10T428/12722; Y10T428/12771; Y10T428/12778; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854; Y10T428/12861; Y10T428/12951; Y10T428/12972; Y10T428/12979
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
81 words
A high-temperature magnetic recording tape comprising a stainless steel substrate, adhered to said substrate an intermediate barrier layer for resisting the diffusion of foreign elements from the substrate, and adhered to said barrier layer a magnetic recording layer comprising cobalt and adhered to said magnetic coating layer an oxidation resistant barrier layer being comprised of chromium, said magnetic coating layer being at least 10 Mu inches thicker than the combined thickness of said intermediate barrier layer and said oxidation-resistant barrier layer.
Claim 2
Dependent Claim
69 words
A high-temperature magnetic recording tape comprising a stainless steel substrate, an intermediate barrier layer comprising tin, adhered to said intermediate barrier layer a magnetic coating layer comprising cobalt and an oxidation resistant barrier layer adhered to said magnetic coating layer being comprised of tin, said magnetic coating layer being at least 10 Mu inches thicker than the combined thickness of said intermediate barrier layer and said oxidation-resistant barrier layer.
Claim 3
Dependent Claim
71 words
A high-temperature magnetic recording tape comprising a stainless steel substrate, adhered to said substrate an intermediate barrier layer comprising zinc, adhered to said intermediate barrier layer a magnetic coating layer comprising cobalt, and adhered to said magnetic coating layer an oxidation resistant barrier layer comprising tin, said magnetic coating layer being at least 10 Mu inches thicker than the combined thickness of said intermediate barrier layer and said oxidation-resistant barrier layer.
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |