US5013616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium of thin metal film type
Assignee: United Module Corp
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Filing: 1990-09-12
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Granted: 1991-05-07
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Expires: 2010-09-12
Abstract
Abstract A magnetic recording medium having a low noise level and comprising a magnetic film made of a Co-Ni-Cr-P alloy. The Co-Ni-Cr-P alloy has a composition represented by the formula (Co.sub.100-a Ni.sub.a).sub.100-b-c Cr.sub.b P.sub.c wherein a, b and c each represent atomic percent, and 3≦a≦40, 2≦b≦10 and 2≦c≦7.
Inventors
- 👤 Toshiaki Morichika
- 👤 Toshio Tani
- 👤 Nobuhiko Tanaka
- 👤 Tatsuhiko Kadowaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:47
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/657; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12931
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A magnetic recording medium comprising a substrate and a magnetic film on the substrate having the following ingredients present in the following ingredients present in the following atomic percentages Co: 63 to 75.2%, Cr: 3 to 10%, Ni: 17.6 to 27% and P: 2 to 5%.
Claim 2
Dependent Claim
46 words
A magnetic recording medium comprising a substrate and a magnetic film on the substrate having the following ingredients present in the following ingredients present in the following atomic percentages Co: 63 to 75.2%, Cr: 3 to 10%, Ni: 17.6 to 27% and P: 2 to 5%.
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) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |