US3779948A
Expired / Lapsed
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Vitreous compounds with bistable electrical characteristics
Assignee: Bpifrance Financement SA
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Filing: 1971-07-28
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Granted: 1973-12-18
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Expires: 1991-07-28
Abstract
Abstract A new class of vitreous compounds having bistable electrical characteristics, that is to say, two different states of electric resistance is described. The new class of vitreous compounds can be represented by the general formula (1):
Inventors
- 👤 J Loriers
- 👤 R Heindl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:35
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/125
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
9 words
The compound of claim 1 wherein x is zero.
Claim 2
Dependent Claim
9 words
The compound of claim 1 wherein y is zero.
Claim 3
Dependent Claim
9 words
The compound of claim 1 wherein z is zero.
Claim 4
Dependent Claim
23 words
The compound of claim 1 wherein x, y and z are simultaneously zero, the said compound corresponding to the formula : Ca2Na2Al V3O12
Claim 5
Dependent Claim
17 words
The compound of claim 1, wherein the element Ln is lanthanum and z is greater than 0.
Claim 6
Dependent Claim
18 words
The compound of claim 1 wherein x, y and z comply with the inequalities x<0.15 y<0.5 and z<0.3
Claim 7
Dependent Claim
147 words
A process for the production of a compound of formula (I): Ca2 x 2zLnz Na2 x z Al1 y Fey V3 O12 xFx (I) wherein the letters have the usual meanings of the elements in the Periodic Table with the exception of Ln which designates an element which is a part of the group of rare earths belonging to the class of lanthanides and yttrium, whereas x, y and z each represent numbers in the range of 0 to 1, which are bound together by ionic equilibrium relationships, said process comprising the steps, (a) preparation of an intimate mixture of precursor products containing the elements of said compound in substantially stoichiometric proportions, (b) heating said mixture at a temperature higher than about 1,300* C for at least 5 hours and, (c) cooling of said heated mixture to normal temperature, the desired vitreous compound forming during said cooling.
Claim 8
Dependent Claim
18 words
The process of claim 8, wherein the heating (b) is carried out for about 6 to 12 hours.
Claim 9
Dependent Claim
19 words
The process of claim 8, wherein during the heating (b) the temperature is maintained between about 1,300* and 1,400*C.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |