Patent US4252779A successfully refreshed from Google Patents.
US4252779A
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Synthetic imogolite
Assignee: BTG International Ltd
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Filing: 1979-04-26
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Granted: 1981-02-24
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Expires: 1999-04-26
Abstract
Abstract An inorganic material related to imogolite, a rare constituent of soil, which forms gels with under 1% solids concentration, is synthesized by digesting (at pH 3.1 to 5.0) soluble hydroxyaluminium complexes freshly formed at pH 3.2 to 5.5 in aqueous solution with restricted aluminium concentration.
Inventors
- 👤 Victor C. Farmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:20
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C01B33/42; B; B01; B01D; B01D53/00; B01D53/02; B01J; B01J20/00; B01J20/02; B01J20/10; C01B33/26; C01B33/40; C01B33/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
An inorganic material, which is a fibrous product having a tubular structure resembling the natural product imogolite but having a 10-15% larger tube diameter and displaying discernible electron diffraction peaks at 1.4 A, 2.1 A and 4.2 A, the walls of said tubes having a structure like that of a single sheet of gibbsite with orthosilicate groups replacing the hydroxyl groups on the inner surfaces of said tubes.
Claim 2
Dependent Claim
68 words
An inorganic material, which is a fibrous product having a tubular structure resembling the natural product imogolite but having a 10-15% larger tube diameter and displaying discernible electron diffraction peaks at 1.4 A, 2.1 A and 4.2 A, the walls of said tubes having a structure like that of a single sheet of gibbsite with orthosilicate groups replacing the hydroxyl groups on the inner surfaces of said tubes.
Claim 3
Dependent Claim
16 words
A membrane composed of the synthetic imogolite material of claim 1 cast into a coherent film.
Claim 4
Dependent Claim
11 words
A colloidal solution of the synthetic imogolite-like material of claim 1.
Claim 5
Dependent Claim
117 words
The colloidal solution of claim 3, prepared by: forming a soluble hydroxyaluminum silicate complex by reacting soluble silica or a soluble silicate compound with an aluminum compound capable of reacting with silica to form a soluble hydroxyaluminum silicate complex in an aqueous solution at a pH of 3.2 to 5.5, the concentration of aluminum from said aluminum compound other than already formed imogolite or stable hydroxyaluminum silicate complex ranging up to 50 millimoles per liter and the Si:Al atomic ratio of the silica and aluminum compound reactants ranging from 0.33 to 0.8; and digesting said aqueous solution of hydroxyaluminum silicate at a pH of from 3.1 to 5.0 thereby forming a colloidal dispersion of said inorganic material.
Claim 6
Dependent Claim
22 words
A gel of synthetic imogolite-like material of claim 1, wherein said gel possesses a solids concentration of less than 1% by weight.
Claim 7
Dependent Claim
13 words
The gel of claim 5, wherein said solids concentration is less than 0.5%.
Claim 8
Dependent Claim
11 words
The gel of claim 6, wherein said solids concentration is 0.1%.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |