US4797331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optical recording material
Assignee: Ricoh Co Ltd
•
Filing: 1986-11-10
•
Granted: 1989-01-10
•
Expires: 2006-11-10
Abstract
Abstract A magneto-optical recording material is disclosed, which consists of magnetoplumbite type ferrite containing barium in which part of Ba is replaced by La and part of Fe is replaced by Co.
Inventors
- 👤 Atsuyuki Watada
- 👤 Fumiya Ohmi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:19
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B11/10589; G11B11/10591; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2633; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08755; G03G9/08784; G03G9/08786; G03G9/08788; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
A magneto-optical recording material consisting of magnetoplumbite type ferrite containing barium in which part of Ba is replaced by La and part of Fe is replaced by Co, wherein said barium magnetoplumbite type ferrite has the following formula: Ba.sub.1-x La.sub.x Co.sub.y Fe.sub.12-y O.sub.19 wherein 0<x<1, x≃y; or has the following formula: Ba.sub.1-x La.sub.x Co.sub.y Fe.sub.12-(y+z) O.sub.19 wherein 0<x<1, 0<z<6, M I represents a metal element having 4, 5 or 6 valences, wherein when M I is a 4-valence metal element, y≃x+z, when M I is a 5-valence metal element, y≃x+2z, and when M I is a 6-valence metal element, y≃x+3z; or has the following formula: Ba.sub.1-x La.sub.x Co.sub.y M.sub.Iz M.sub.IIu Fe.sub.12-(y+z+u) O.sub.19 wherein 0<x<1, 0<z<6, M I represents a metal element having 4, 5 or 6 valences, and M II represents a metal element having 3 valences, wherein when M I is a 4-valence metal element, y≃x+z, when M I is a 5-valence metal element, y≃x+2z, and when M I is a 6-valence metal element, y≃x+3z.
Claim 2
Dependent Claim
166 words
A magneto-optical recording material consisting of magnetoplumbite type ferrite containing barium in which part of Ba is replaced by La and part of Fe is replaced by Co, wherein said barium magnetoplumbite type ferrite has the following formula: Ba.sub.1-x La.sub.x Co.sub.y Fe.sub.12-y O.sub.19 wherein 0<x<1, x≃y; or has the following formula: Ba.sub.1-x La.sub.x Co.sub.y Fe.sub.12-(y+z) O.sub.19 wherein 0<x<1, 0<z<6, M I represents a metal element having 4, 5 or 6 valences, wherein when M I is a 4-valence metal element, y≃x+z, when M I is a 5-valence metal element, y≃x+2z, and when M I is a 6-valence metal element, y≃x+3z; or has the following formula: Ba.sub.1-x La.sub.x Co.sub.y M.sub.Iz M.sub.IIu Fe.sub.12-(y+z+u) O.sub.19 wherein 0<x<1, 0<z<6, M I represents a metal element having 4, 5 or 6 valences, and M II represents a metal element having 3 valences, wherein when M I is a 4-valence metal element, y≃x+z, when M I is a 5-valence metal element, y≃x+2z, and when M I is a 6-valence metal element, y≃x+3z.
Claim 3
Dependent Claim
25 words
The magneto-optical recording material as claimed in claim 1, wherein said magnetoplumbite type ferrite has the following formula: Ba1-xLa.sub.x Co.sub.y Fe.sub.12-y O.sub.19 wherein 0<x≦1, x≃y.
Claim 4
Dependent Claim
62 words
The magneto-optical recording material as claimed in claim 1 has the following formula: Ba1-xLa.sub.x Co.sub.y M.sub.Iz Fe.sub.12-(y+z) O.sub.19 wherein 0<x<1, 0<z≦6, M I represents a metal element having 4, 5 or 6 valences, wherein when M I is a 4-valence metal element, y≃x+z, when M I is a 5-valence metal element, y≃x+2z, and when M I is a 6-valence metal element, y≃x+3z.
Claim 5
Dependent Claim
71 words
The magneto-optical recording material as claimed in claim 1 has the following formula: Ba1-xLa.sub.x Co.sub.y M.sub.Iz M.sub.IIu Fe.sub.12-(y+z+u) O.sub.19 wherein 0<x<1, 0<z≦6, M I represents a metal element having 4 or more valences, and M II represents a metal element having 3 valences, wherein when M I is a 4-valence element, y≃x+z, when M I is a 5-valence metal element, y≃x+2z, and when M I is a 6-valence metal element, y≃x+3z.
Claim 6
Dependent Claim
52 words
The magneto-optical recording material as claimed in claim 3, wherein said 4-valence metal element is selected from, the group consisting of Ti, W, Zr, Hf, Ru, Os, Ir and Pt, said 5-valence metal element is selected from the group consisting of Ta, Nb and V, and said 6-valence metal element is Mo.
Claim 7
Dependent Claim
51 words
The magneto-optical recording material as claimed in claim 4, wherein said 4-valence metal element is selected from the group consisting of Ti, W, Zr, Hf, Ru, Os, Ir, Pt, and said 3-valence metal element represented by M II is selected from the group consisting of Ga, Al, In, Sc and Cr.
References Cited (Backward Citations)
JPS58199722A
Cited
JPS5945644A
Cited
US4543198A
Cited
US4544602A
Cited
DE3413086A1
Cited
US4562105A
Cited
JPS60133711A
Cited
JPS60152010A
Cited
JPS60164303A
Cited
JPS60180920A
Cited
JPS61136683A
Cited
DE3608021A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |