US3639247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcium-vanadium series ferrimagnetic garnets
Assignee: NEC Corp
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Filing: 1970-02-04
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Granted: 1972-02-01
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Expires: 1990-02-04
Abstract
Abstract Calcium-vanadium ferrimagnetic garnets having the compositions expressed by the formula: Ca3-y Yy [Fe2] (Fe1.5-0.5x+0.5yGExV1.5-0.5x-0.5y)012, wherein values of x and y lie within the polygonal area A-B-C-D-E shown in FIG. 7 of the drawing which is bounded by the lines connecting the coordinates:
Inventors
- 👤 Hideo Takamizawa
- 👤 Keiichi Yotsuyanagi
- 👤 Takashi Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:57
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2641
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
Calcium-vanadium ferrimagnetic garnets having compositions expressed by the formula: Ca3 yYy (Fe2 zTaz)(Fe1.5 0.5x 0.5y zGexV1.5 0.5x 0.5y z)O12 wherein values of x, y and z are in the ranges expressed as 0.05 < or = x < or = 0.08; 0.05 < or = y < or = 1.4 and 0<z < or = 0.17, respectively, but excluding the values of x, y and z determined by the relation 0.95 < or = 4z+y-x < or = 1.05.
Claim 2
Dependent Claim
73 words
Calcium-vanadium series ferrimagnetic garnets as claimed in claim 2, wherein the values of x, y and z are in the ranges of 0.1 < or = x < or = 0.8; 0.05 < or = y < or = 1.4 and 0.02 < or = z < or = 1.7, respectively, but excluding the values of x, y and z determined by the relation 0.8 < or = 4z+y-x < or = 1.2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |