Patent US3723600A successfully refreshed from Google Patents.
US3723600A
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Rare earth tellurites and method of producing same
Assignee: Kennecott Utah Copper LLC
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Filing: 1971-10-18
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Granted: 1973-03-27
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Expires: 1991-10-18
Abstract
Abstract Tellurium compounds having the general formula (AxBy)Te4011 where A and B is a rare earth metal or yttrium, x is from 0 to 2, y is from 0 to 2, and x plus y is 2. Where A and B are the same metal the formula is M2Te4011. The compounds are prepared by reactions between Te02 and the rare earth oxides.
Inventors
- 👤 M Redman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:52
CPC Classifications
C; C01; C01B; C01B19/00; C01B19/008; C09; C09C; C09C1/00; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/74; C01P2002/77; C01P2006/00; C01P2006/10; C01P2006/40; C01P2006/60; C01P2006/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
28 words
The composition of claim 1 wherein A and B are selected from the group of lanthanum, neodymium, samarium, europium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and yttrium.
Claim 2
Dependent Claim
18 words
A new composition of matter having the formula M2Te4O11 where M is a rare earth metal or yttrium.
Claim 3
Dependent Claim
23 words
The composition of claim 3 wherein M is selected from lanthanum, neodymium, samarium, europium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and yttrium.
Claim 4
Dependent Claim
14 words
The composition of claim 3 wherein M is a mixture of rare earth metals.
Claim 5
Independent Claim
89 words
The method of making the compound M2Te4O11, where M is selected from lanthanum, neodymium, samarium, europium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and yttrium by the solid-state reaction which comprises intimately mixing powders of M2O3 and TeO2 in a molar ratio of TeO2 to M2O3 of at least 4:1, compressing the admixture into a cohesive mass, heating in a non-reducing atmosphere at a temperature at least from about 700* C up to the temperature at which the compound begins to decompose, cooling to room temperature and recovering M2Te4O11.
Claim 6
Dependent Claim
14 words
The method of claim 6 wherein M is a mixture of rare earth metals.
Claim 7
Independent Claim
66 words
The method of making single crystals having the general formula M2Te4O11 where M is selected from lanthanum, neodymium, samarium, europium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and yttrium comprising intimately mixing M2O3 with an excess of TeO2, heating the mixture to its melting point, slowly cooling the melt at no more than 100* C per hour and separating the crystals of M2Te4O11 from the matrix.
Claim 8
Dependent Claim
19 words
The method of claim 8 wherein a seed crystal is introduced into the melt on which the crystal grows.
Claim 9
Dependent Claim
14 words
The method of claim 8 wherein M is a mixture of rare earth metals.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |