US4587176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Layered coherent structures for magnetic recording
Assignee: EIDP Inc
•
Filing: 1985-01-14
•
Granted: 1986-05-06
•
Expires: 2005-01-14
Abstract
Abstract Layered coherent structures characterized by periodic, alternating layers of cobalt and palladium and/or platinum exhibit perpendicular magnetic anistropy.
Inventors
- 👤 Peter F. Carcia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/66; G11B5/676; G11B5/678; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/12; Y10T428/12465; Y10T428/12493; Y10T428/12535; Y10T428/12632; Y10T428/12771; Y10T428/12861; Y10T428/12875
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
50 words
A layered coherent structure characterized by periodic, alternating layers of cobalt and palladium and/or platinum, wherein each cobalt layer is less than about 8 Å thick, and each palladium and/or platinum layer is greater than about 0.65 λ in thickness, where λ represents the total thickness of a single period.
Claim 2
Dependent Claim
50 words
A layered coherent structure characterized by periodic, alternating layers of cobalt and palladium and/or platinum, wherein each cobalt layer is less than about 8 Å thick, and each palladium and/or platinum layer is greater than about 0.65 λ in thickness, where λ represents the total thickness of a single period.
Claim 3
Dependent Claim
15 words
A structure according to claim 1, characterized by periodic, alternating layers of cobalt and palladium.
Claim 4
Dependent Claim
17 words
A structure according to claim 2, wherein each cobalt layer is less than about 7 Å thick.
Claim 5
Dependent Claim
18 words
A structure according to claim 3, wherein each palladium layer is greater than about 0.80 λ in thickness.
Claim 6
Dependent Claim
14 words
A structure according to claim 4, wherein λ is less than about 100 Å.
Claim 7
Dependent Claim
17 words
A structure according to claim 5, wherein each cobalt layer is less than about 5 Å thick.
Claim 8
Dependent Claim
18 words
A structure according to claim 6, wherein each palladium layer is greater than about 0.90 λ in thickness.
Claim 9
Dependent Claim
20 words
A recording member comprising a substrate and a recording layer consisting essentially of a layered coherent structure of claim 1.
Claim 10
Dependent Claim
20 words
A recording member comprising a substrate and a recording layer consisting essentially of a layered coherent structure of claim 2.
Claim 11
Dependent Claim
20 words
A recording member according to claim 9, wherein the recording layer is between 3,000 and 20,000 Å in total thickness.
Claim 12
Dependent Claim
34 words
A recording member comprising a substrate and a recording layer, wherein the recording layer is between 3,000 and 20,000 Å in total thickness and consists essentially of a layered coherent structure of claim 3.
Claim 13
Dependent Claim
34 words
A recording member comprising a substrate and a recording layer, wherein the recording layer is between 3,000 and 20,000 Å in total thickness and consists essentially of a layer coherent structure of claim 4.
Claim 14
Dependent Claim
34 words
A recording member comprising a substrate and a recording layer, wherein the recording layer is between 3,000 and 20,000 Å in total thickness and consists essentially of a layer coherent structure of claim 5.
Claim 15
Dependent Claim
34 words
A recording member comprising a substrate and a recording layer, wherein the recording layer is between 3,000 and 20,000 Å in total thickness and consists essentially of a layer coherent structure of claim 6.
Claim 16
Dependent Claim
34 words
A recording member comprising a substrate and a recording layer, wherein the recording layer is between 3,000 and 20,000 Å in total thickness and consists essentially of a layer coherent structure of claim 7.
References Cited (Backward Citations)
US3350180A
Cited
US3269854A
Cited
US3479156A
Cited
US3787237A
Cited
US4429016A
Cited
US4452864A
Cited
US4472248A
Cited
US4447467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |