US3721613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Article having an electroless deposition and method of producing such article
Assignee: Unisys Corp
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Filing: 1971-12-06
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Granted: 1973-03-20
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Expires: 1991-12-06
Abstract
Abstract THE INVENTION RELATES TO A METHOD OF PRODUCING A STORAGE MEDIUM HAVING A HEAT HARDENED LAYER OF A MAGNETIC METAL OR ALLOY. THE INVENTION ALSO RELATES TO A METHOD OF PROVIDING AN ALUMINUM SUBSTRATE FOR A MAGNETIC STORAGE MEDIUM AND ANODIZING THE ALUMINUM SURFACE AND APPLYING A METALLIC LAYER BEFORE THE EFFECTS OF THE ANODIZING HAVE DISAPPEARED.
Inventors
- 👤 G Wilhelm
- 👤 S Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:04
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |