Patent US4267065A successfully refreshed from Google Patents.
US4267065A
Expired / Lapsed
US
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Dispersants for a ceramic slurry
Assignee: AT&T Inc
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Filing: 1978-08-01
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Granted: 1981-05-12
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Expires: 1998-08-01
Abstract
Abstract Many ceramics are produced with a processing sequence that includes spray drying or ball milling a slurry. To produce ceramics with the best properties and to facilitate ball milling or spray drying, a dispersant is normally added to the ceramic slurry. Ammonium citrate and polyethylenimine have been found to produce ceramic slurries with the desired characteristics. The dispersants appear especially well suited for use with ferrite slurries.
Inventors
- 👤 David W. Johnson, Jr.
- 👤 Eva M. Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:22
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
A method of processing ceramics which comprises forming a slurry and spray drying said slurry under conventional conditions to yield a product consisting of ceramic material and a dispersant said ceramic material forming between 65 percent and 80 percent by weight of said slurry and being a mixture of metal oxides suitable for forming a ferrite CHARACTERIZED IN THAT said dispersant is ammonium citrate having a concentration of 0.02 to 0.8 percent by weight of the ceramic material.
Claim 2
Independent Claim
78 words
A method of processing ceramics which comprises forming a slurry and spray drying said slurry under conventional conditions to yield a product consisting of ceramic material and a dispersant said ceramic material forming between 65 percent and 80 percent by weight of said slurry and being a mixture of metal oxides suitable for forming a ferrite CHARACTERIZED IN THAT said dispersant is ammonium citrate having a concentration of 0.02 to 0.8 percent by weight of the ceramic material.
Claim 3
Dependent Claim
19 words
A method as recited in claim 1 in which said slurry has a solids content of approximately 75 percent.
Claim 4
Dependent Claim
15 words
A method as recited in claim 1 in which said ferrite is a MnZn ferrite.
Claim 5
Dependent Claim
21 words
A method as recited in claim 1 in which said concentration is approximately 0.2 percent by weight of the ceramic material.
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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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |