US4323629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallic thin film magnetic recording medium
Assignee: Panasonic Holdings Corp
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Filing: 1980-07-11
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Granted: 1982-04-06
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Expires: 2000-07-11
Abstract
Abstract A magnetic thin film deposited on a non-magnetic substrate consists substantially of Ni, Co and oxygen, the content of Ni being between 10 and 55% by weight based on the weight of Ni and Co, the atomic percent ratio of oxygen to Ni and Co being between 3 and 45%.
Inventors
- 👤 Toshiaki Kunieda
- 👤 Masaru Odagiri
- 👤 Takashi Fujita
- 👤 Koichi Shinohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:38
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/658; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/12; H01F10/16; H01F41/00; H01F41/14; H01F41/20; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/1266; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12944; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
A metallic thin film recording medium comprising a magnetic thin film deposited from the vapor phase in an oxygen atmosphere on a non-magnetic substrate, said thin film consisting essentially of nickel, cobalt and oxygen; the content of nickel being between 10 and 55 percent by weight based on the weight of nickel and cobalt; and the ratio of the oxygen atoms to the sum of the nickel and cobalt atoms in atomic percent being between 3 and 45 percent.
Claim 2
Dependent Claim
79 words
A metallic thin film recording medium comprising a magnetic thin film deposited from the vapor phase in an oxygen atmosphere on a non-magnetic substrate, said thin film consisting essentially of nickel, cobalt and oxygen; the content of nickel being between 10 and 55 percent by weight based on the weight of nickel and cobalt; and the ratio of the oxygen atoms to the sum of the nickel and cobalt atoms in atomic percent being between 3 and 45 percent.
Claim 3
Dependent Claim
37 words
A metallic thin film recording medium as claimed in claim 1, wherein said magnetic thin film is deposited on said non-magnetic substrate from the vapor phase at an angle of deposition of from 40 to 80 degrees.
Claim 4
Dependent Claim
32 words
A metallic thin film recording medium as claimed in claim 1, wherein said non-magnetic substrate is a continuous strip thereof and said magnetic thin film is continuously deposited on said non-magnetic substrate.
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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) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |