US2935376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of precipitating alumina hydrate from a pregnant caustic aluminate liquor
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1957-04-08
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Granted: 1960-05-03
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Expires: 1977-04-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Reginald F Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:28
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/14; C01F7/144; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
A PROCESS OF PRECIPITATING ALUMINA HYDRATE FROM A PREGNANT CAUSTIC ALUMINATE LIQUOR, WHEREIN THE LIQUOR IS AT A TEMPERATURE AT WHICH THE ALUMINA HYDRATE MAY BE PRECIPITATED BY SEEDING SAID LIQUOR WITH AN ALUMINA HYDRATE SLURRY, WHICH COMPRISES HEATING AN ALUMINA HYDRATE SLURRY, BEFORE ADDITION TO THE SAID LIQUOR, TO A TEMPERATURE ABOVE THE TEMPERATURE OF SAID LIQUOR, AND ADDING SAID HEATED SLURRY TO SAID LIQUOR.
Claim 2
Dependent Claim
66 words
A PROCESS OF PRECIPITATING ALUMINA HYDRATE FROM A PREGNANT CAUSTIC ALUMINATE LIQUOR, WHEREIN THE LIQUOR IS AT A TEMPERATURE AT WHICH THE ALUMINA HYDRATE MAY BE PRECIPITATED BY SEEDING SAID LIQUOR WITH AN ALUMINA HYDRATE SLURRY, WHICH COMPRISES HEATING AN ALUMINA HYDRATE SLURRY, BEFORE ADDITION TO THE SAID LIQUOR, TO A TEMPERATURE ABOVE THE TEMPERATURE OF SAID LIQUOR, AND ADDING SAID HEATED SLURRY TO SAID LIQUOR.
Claim 3
Dependent Claim
116 words
IN A PROCESS OF PRECIPITATING ALUMINA HYDRATE FROM A PREGNANT CAUSTIC ALUMINATE LIQUOR, WHEREIN SAID LIQUOR IS AT A TEMPERATURE AT WHICH THE ALUMINA HYDRATE MAY BE PRECIPITATED BY SEEDING SAID LIQUOR WITH AN ALUMINA HYDRATE SLURRY CONTAMINATED WITH SOLID ORGANIC MATERIALS WHICH ACT AS SEED PARTICLES FOR THE ALUMINA CONTENT OF SAID CAUSTIC LIQUOR, THE IMPROVEMENT WHICH COMPRISES HEATING AN ALUMINA HYDRATE SEED SLURRY CONTAMINATED WITH SOLID ORGANIC MATERIALS, BEFORE ADDITION TO SAID CAUSTIC LIQUOR, TO A TEMPERATURE ABOVE THE TEMPERATURE OF SAID LIQUOR AND SUFFICIENT TO DISSOLVE A PORTION OF THE SOLID ORGANIC MATERIALS, AND ADDING SAID HEATED SLURRY TO SAID LIQUOR, WHEREBY A RELATIVELY COARSER AND FASTER SETLIHNG ALUMINA HYDRATE PRODUCT IS PRECIPITATED.
Claim 4
Dependent Claim
116 words
IN A PROCESS OF PRECIPITATING ALUMINA HYDRATE FROM A PREGNANT CAUSTIC ALUMINATE LIQUOR, WHEREIN SAID LIQUOR IS AT A TEMPERATURE AT WHICH THE ALUMINA HYDRATE MAY BE PRECIPITATED BY SEEDING SAID LIQUOR WITH AN ALUMINA HYDRATE SLURRY CONTAMINATED WITH SOLID ORGANIC MATERIALS WHICH ACT AS SEED PARTICLES FOR THE ALUMINA CONTENT OF SAID CAUSTIC LIQUOR, THE IMPROVEMENT WHICH COMPRISES HEATING AN ALUMINA HYDRATE SEED SLURRY CONTAMINATED WITH SOLID ORGANIC MATERIALS, BEFORE ADDITION TO SAID CAUSTIC LIQUOR, TO A TEMPERATURE ABOVE THE TEMPERATURE OF SAID LIQUOR AND SUFFICIENT TO DISSOLVE A PORTION OF THE SOLID ORGANIC MATERIALS, AND ADDING SAID HEATED SLURRY TO SAID LIQUOR, WHEREBY A RELATIVELY COARSER AND FASTER SETLIHNG ALUMINA HYDRATE PRODUCT IS PRECIPITATED.
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) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |