US4454206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic device having a monocrystalline garnet substrate bearing a magnetic layer
Assignee: US Philips Corp
•
Filing: 1982-07-22
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Granted: 1984-06-12
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Expires: 2002-07-22
Abstract
Abstract Magnetic device having a monocrystalline substrate bearing a magnetic layer, said substrate having a composition on the basis of rare earth metal gallium garnet of the general formula ##STR1## wherein A=gadolinium and/or samarium and/or neodym and/or yttrium B=calcium and/or strontium C=magnesium D=zirconium and/or tin and O<x≦0.7; O<y≦0.7 and x+y≦0.8.
Inventors
- 👤 Dieter Mateika
- 👤 Rolf Laurien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:59
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/26; H01F10/28; C; C30; C30B; C30B19/00; C30B19/02; C30B19/12; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/28; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
50 words
A magnetic device having a monocrystalline rare earth metal gallium garnet substrate bearing a monocrystalline magnetic layer of garnet material, characterized in that the substrate has the composition ##STR5## in which A=gadolinium and/or samarium and/or neodym and/or yttrium B=calcium and/or strontium C=magnesium D=zirconium and /or tin O<×≦0.7: O<y≦0.7 and×+y ≦0.8.
Claim 2
Dependent Claim
50 words
A magnetic device having a monocrystalline rare earth metal gallium garnet substrate bearing a monocrystalline magnetic layer of garnet material, characterized in that the substrate has the composition ##STR5## in which A=gadolinium and/or samarium and/or neodym and/or yttrium B=calcium and/or strontium C=magnesium D=zirconium and /or tin O<×≦0.7: O<y≦0.7 and×+y ≦0.8.
Claim 3
Dependent Claim
15 words
A magnetic device as claimed in claim 1, characterized in that 0.1≦+, y≦0.4 and 0.5≦×+y≦0.7.
Claim 4
Dependent Claim
36 words
A magnetic device as claimed in claim 1 or 2, characterized in that the substrate has the composition Gd 2 .65 Ca 0 .35 Ga 4 .05 Mg 0 .3 Zr 0 .65 O 12 .
Claim 5
Dependent Claim
36 words
A magnetic device as claimed in claims 1 or 2, characterized in that the substrate has the composition Gd 2 .6 Ca 0 .4 Ga 4 .1 Mg 0 .25 Zr 0 .65 O 12 .
References Cited (Backward Citations)
US3959006A
Cited
US4199396A
Cited
US4169189A
Cited
US4138530A
Cited
US4165410A
Cited
US4355072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |