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Patent US3856567A successfully refreshed from Google Patents.
US3856567A
Expired / Lapsed
US
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Electrode for porous ceramic and method of making same
Assignee: Individual
•
Filing: 1973-10-04
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Granted: 1974-12-24
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Expires: 1993-10-04
Abstract
Abstract A porous ceramic is provided on its surface with an electrode comprising a titanium oxide and a more readily reduceable metal oxide. Also disclosed is a method for applying the above electrode. The method includes the step of applying to a substrate of unfired ceramic composition a fluid suspension mixture of a titanium oxide and a metal oxide more readily reduceable than the titanium oxide. The substrate is then fired at a temperature of between 1,200* and 1,300*C until the titanium oxide is reduced to form a relatively conductive oxide comprising less oxygen than the stoichiometric form of titanium oxide.
Inventors
- 👤 H Ellis
- 👤 J Pitha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:22
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/118; H01C17/00; H01C17/28; H01C17/281; H01C17/283; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249969
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
A METHOD OF FORMING AN ELECTRODE ON A POROUS CERAMIC SUBSTRATE COMPRISING THE STEPS OF: APPLYING TO THE SURFACE OF A POROUS GRANULAR SUBSTRATE A LAYER OF A FINELY DIVIDED TITANIUM OXIDE; HEATING THE SUBSTRATE WITH THE APPLIED LAYER IN A REDUCING ATMOSPHERE TO A TEMPERAURE OF BETWEEN 1,2000* TO 1,300*C UNTIL THE TITANIUM OXIDE IS REDUCED MORE THAN IT IS IN ITS STOICHIOMETRIC STATE AND BECOMES RELATIVELY CONDUCTIVE, AND COOLING THE SUBSTRATE TO ROOM TEMPERATURE .
Claim 2
Independent Claim
77 words
A METHOD OF FORMING AN ELECTRODE ON A POROUS CERAMIC SUBSTRATE COMPRISING THE STEPS OF: APPLYING TO THE SURFACE OF A POROUS GRANULAR SUBSTRATE A LAYER OF A FINELY DIVIDED TITANIUM OXIDE; HEATING THE SUBSTRATE WITH THE APPLIED LAYER IN A REDUCING ATMOSPHERE TO A TEMPERAURE OF BETWEEN 1,2000* TO 1,300*C UNTIL THE TITANIUM OXIDE IS REDUCED MORE THAN IT IS IN ITS STOICHIOMETRIC STATE AND BECOMES RELATIVELY CONDUCTIVE, AND COOLING THE SUBSTRATE TO ROOM TEMPERATURE .
Claim 3
Dependent Claim
29 words
The method defined in claim 1 and wherein there is mixed with the titanium oxide an added metal oxide which is more readily reduceable than is the titanium oxide.
Claim 4
Dependent Claim
14 words
The method defined in claim 2 wherein the substrate is an unfired ceramic composition.
Claim 5
Dependent Claim
15 words
The method defined in claim 3 wherein the added oxide is an oxide of chromium.
Claim 6
Dependent Claim
21 words
The method defined in claim 4 wherein said substrate is a pressed body of silicon carbide particles held by a binder.
Claim 7
Dependent Claim
41 words
The method defined in claim 5 wherein the titanium oxide is present in the oxide mixture to between 50 and 90 percent by molecular weight and the added metal oxide is present to between 0 and 40 percent by molecular weight.
Claim 8
Dependent Claim
27 words
The method defined in claim 6 wherein the titanium oxide and the added oxide are suspended in a fluid with a suspending agent prior to said applying.
Claim 9
Dependent Claim
30 words
The method defined in claim 7 wherein the fluid is water and the suspending agent is clay present to between 5 and 10 percent by molecular weight in the mixture.
Claim 10
Dependent Claim
36 words
A method as defined in claim 8 wherein said reducing atmosphere is formed of gas from the class of hydrogen and cracked ammonia, and comprises at least 50 to 100 percent by volume of such gas.
Claim 11
Dependent Claim
23 words
A method as defined in claim 9 wherein the firing operation is continued for at least 1 hour at at least 1,200* C.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |