US3085853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of employing dextrans
Assignee: Dow Chemical Co
•
Filing: 1958-12-23
•
Granted: 1963-04-16
•
Expires: 1978-12-23
Abstract
No abstract record available.
Inventors
- 👤 Chester A Lesinski
- 👤 Edward J Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:21
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/016; C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/06; C01F7/0646; C01F7/0653; C02; C02F; C02F1/00; C02F1/52; C02F1/5263; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0021; C22; C22B; C22B3/00; C22B3/18; B03D2201/00; B03D2201/002; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN THE METHOD FOR EXTRACTING ALUMINA FROM BAUXITE WHEREIN THE BAUXITE IS DIGESTED AT AN ELEVATED TEMPERATURE WITH A STRONGLY ALKALINE AQUEOUS SLUTION TO PRODUCE A SOLUTION OF ALUMINA CONTANING FINELY DIVIDED SOLID IMPURITIES IN SUSPENSION THEREIN AND SAID IMPURITIES ARE THEREAFTER SEPARATED FROM SUSPENSION BY SEDIMENTATION, THE IMPROVEMENT WHICH COMPRISES THROUGHLY MIXING A NATIVE DEXTRAN WITH THE SUSPENSION PRIOR TO THE INITIATION OF SEDIMENTATION, SAID DEXTRAN BEING EMPLOYED IN THE AMOUNT OF FROM ABOUT 0.1 TO 3 POUNDS PER TON OF AUXITE EXTRACTED.
Claim 2
Dependent Claim
84 words
IN THE METHOD FOR EXTRACTING ALUMINA FROM BAUXITE WHEREIN THE BAUXITE IS DIGESTED AT AN ELEVATED TEMPERATURE WITH A STRONGLY ALKALINE AQUEOUS SLUTION TO PRODUCE A SOLUTION OF ALUMINA CONTANING FINELY DIVIDED SOLID IMPURITIES IN SUSPENSION THEREIN AND SAID IMPURITIES ARE THEREAFTER SEPARATED FROM SUSPENSION BY SEDIMENTATION, THE IMPROVEMENT WHICH COMPRISES THROUGHLY MIXING A NATIVE DEXTRAN WITH THE SUSPENSION PRIOR TO THE INITIATION OF SEDIMENTATION, SAID DEXTRAN BEING EMPLOYED IN THE AMOUNT OF FROM ABOUT 0.1 TO 3 POUNDS PER TON OF AUXITE EXTRACTED.
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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) | 1966-04-15 | 1966-10-15 | 1967-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-15 | 1970-10-15 | 1971-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-15 | 1974-10-15 | 1975-04-16 | $7700.00 | Window Closed / Lapsed |