US4193769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ZnO dispersions by decomposition of ZnCO3
Assignee: Baker Hughes Holdings LLC
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Filing: 1978-10-23
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Granted: 1980-03-18
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Expires: 1998-10-23
Abstract
Abstract This invention relates to stable, fluid zinc-containing dispersions and the preparations thereof by the high temperature decomposition of ZnCO 3 to ZnO in a dispersant-containing fluid.
Inventors
- 👤 William J. Cheng
- 👤 David B. Guthrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:46
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/02; C09; C09D; C09D17/00; C09D17/004; C09D17/007; Y; Y10; Y10S; Y10S516/00; Y10S516/922; Y10S516/924; Y10S516/928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A process of preparing a stable, bright, clear, fluid zinc-containing dispersion which comprises decomposing ZnCO 3 to ZnO at a temperature between about 175° C. to about 450° C. in a dispersant-containing fluid, said fluid being a non-volatile process fluid capable of being heated to the decomposition temperature of ZnCO 3 , said dispersant being relatively stable under the high temperature conditions of this process and being capable of retaining the zinc compound formed by decomposition in stable suspension.
Claim 2
Dependent Claim
79 words
A process of preparing a stable, bright, clear, fluid zinc-containing dispersion which comprises decomposing ZnCO 3 to ZnO at a temperature between about 175° C. to about 450° C. in a dispersant-containing fluid, said fluid being a non-volatile process fluid capable of being heated to the decomposition temperature of ZnCO 3 , said dispersant being relatively stable under the high temperature conditions of this process and being capable of retaining the zinc compound formed by decomposition in stable suspension.
Claim 3
Dependent Claim
17 words
The process of claim 1 where the decomposition temperature is between about 225°0 C. and 350° C.
Claim 4
Dependent Claim
23 words
The product of claim 1 wherein the particle size of the ZnO formed in the dispersion is no greater than about 5 microns.
Claim 5
Dependent Claim
23 words
The product of claim 1 wherein the particle size of the ZnO formed in the dispersion is no greater than about 1 micron.
Claim 6
Dependent Claim
27 words
The process of claim 1 where the non-volatile process fluid is mineral oil, paraffin oil, aromatic oil, diphenyl oxide fluids, silicone oils, polyglycol ethers or vegetable oils.
Claim 7
Dependent Claim
37 words
The process of claim 1 where the dispersants are saturated and unsaturated fatty acids and derivatives thereof, mahogany or petroleum derived sulfonic acids, synthetic sulfonic acids, naphthenic acids, oxyalkylated fatty amines, alkylphenols, sulfurized alkylphenols or oxyalkylated alkylphenols.
References Cited (Backward Citations)
US3409560A
Cited
US3674476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-18 | 1983-09-17 | 1984-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-18 | 1987-09-17 | 1988-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-18 | 1991-09-17 | 1992-03-18 | $7700.00 | Window Closed / Lapsed |