US3763045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcium-vanadium ferrimagnetic garnets
Assignee: NEC Corp
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Filing: 1971-04-01
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Granted: 1973-10-02
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Expires: 1991-04-01
Abstract
Abstract Provided are magnetic materials suitable for use in microwave circuit elements and having excellent properties such as a very low value of the ferromagnetic resonance linewidth, high curie temperature, a suitably controllable value of the saturation magnetization and improved temperature stability of the saturation magnetization. Such materials are obtained by substituting Ca ions located on the 24c site and Fe ions on the 16a site in calcium-vanadium garnets with Y ions and Sn ions, respectively, or by further substituting the ions located on the 24d site in the calcium-vanadium garnets thus modified with Ge ions.
Inventors
- 👤 H Takamizawa
- 👤 K Yotsuyanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:38
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2641
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
Ferrimagnetic garnets having compositions expressed by the formula: (Ca3 yYy)(Fe2 xSnx)(Fe1.5 0.5x 0.5y 0.5zGezV1.5 0.5x 0.5y 0.5z)O12 comprising; a. an amount of Sn expressed by x as follows: 0.25 < or = x < or = 0.5, b. an amount of Y expressed by y as follows: 1.2 < or = y < or = 2.4, c. an amount of Ge expressed by z as follows: 0.2 < or = z < or = 0.4, d. wherein the values of x, y and z which meet the relation 0.8 < or = 3x+y-z < or = 1.2 are excluded, e. and including the limitation that 1.5- 0.5x-0.5y-0.5z>0.
References Cited (Backward Citations)
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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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |