US3947372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrimagnetic material
Assignee: Hitachi Ltd
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Filing: 1973-07-25
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Granted: 1976-03-30
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Expires: 1993-07-25
Abstract
Abstract The temperature for preparation of garnet phase of the conventional yttrium or rare-earth iron garnet can be lowered by about several hundreds centigrade by substituting 24C site of the garnet by lead. Thus obtained lead-substituted yttrium or rare-earth iron garnet has greater specific Faraday rotation than lead-nonsubstituted yttrium or rare-earth iron garnet.
Inventors
- 👤 Kiminari Shinagawa
- 👤 Sadao Hishiyama
- 👤 Hiroshi Takeuchi
- 👤 Satoshi Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:27
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2641; C04B35/2608
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A polycrystalline ferrimagnetic material having a garnet structure and comprising a yttrium or rare-earth iron garnet represented by the general formula: R.sub.3.sub.-x Pb.sub.x Fe.sub.5.sub.-y M.sub.y O.sub.12 wherein R is an element selected from the group consisting of yttrium and rare-earth elements, M is at least one metal selected from the group consisting of niobium, tantalum, ruthenium, germanium, vanadium, antimony, titanium, zinconium, hafnium, silicon and tin, and the ranges of x and y are 0.05 ≦ x ≦ 1.5 and 0.05 ≦ y ≦ 1.5, respectively.
Claim 2
Dependent Claim
85 words
A polycrystalline ferrimagnetic material having a garnet structure and comprising a yttrium or rare-earth iron garnet represented by the general formula: R.sub.3.sub.-x Pb.sub.x Fe.sub.5.sub.-y M.sub.y O.sub.12 wherein R is an element selected from the group consisting of yttrium and rare-earth elements, M is at least one metal selected from the group consisting of niobium, tantalum, ruthenium, germanium, vanadium, antimony, titanium, zinconium, hafnium, silicon and tin, and the ranges of x and y are 0.05 ≦ x ≦ 1.5 and 0.05 ≦ y ≦ 1.5, respectively.
Claim 3
Dependent Claim
19 words
A polycrystalline ferrimagnetic material according to claim 1, wherein the range of x is 0.3 ≦ x ≦ 1.5.
Claim 4
Dependent Claim
12 words
A polycrystalline ferrimagnetic material according to claim 2, wherein R is yttrium.
Claim 5
Dependent Claim
12 words
A polycrystalline ferrimagnetic material according to claim 3, wherein M is germanium.
Claim 6
Dependent Claim
12 words
A polycrystalline ferrimagnetic material according to claim 4, wherein x = y.
Claim 7
Dependent Claim
12 words
A polycrystalline ferrimagnetic material according to claim 1, wherein R is yttrium.
Claim 8
Dependent Claim
12 words
A polycrystalline ferrimagnetic material according to claim 6, wherein M is germanium.
Claim 9
Dependent Claim
12 words
A polycrystalline ferrimagnetic material according to claim 7, wherein x = y.
References Cited (Backward Citations)
US3763045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |