US3775141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardened inorganic refractory fibrous compositions
Assignee: EIDP Inc
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Filing: 1972-05-03
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Granted: 1973-11-27
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Expires: 1992-05-03
Abstract
Abstract Inorganic fibers such as mineral wool are bonded in a coherent mass with a binder such as colloidal positively charged particles having a silica core and a coating of a polyvalent metal-oxygen compound. The binder is flocculated from solution onto the fibers by agents such as attapulgite or hectorite. A flocculated and bonded wet compact of this material is impregnated with negatively charged colloidal silica to produce a hard body.
Inventors
- 👤 V Weidman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:40
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
23 words
The composition of claim 1 wherein the binder is a sol of particles having a silica core coated with a polyvalent metal-oxygen compound.
Claim 2
Dependent Claim
17 words
The composition of claim 2 wherein the ratio of binder to flocculent is from 2:3 to 4:3.
Claim 3
Dependent Claim
26 words
The composition of claim 2 having from 75 to 90 parts by weight inorganic refractory fibers and 10 to 25 parts by weight binder plus flocculent.
Claim 4
Dependent Claim
10 words
The composition of claim 4 wherein the flocculent is montmorillonite.
Claim 5
Dependent Claim
22 words
The composition of claim 1 wherein from 30% to 150% by weight impregnant is used based on the weight of the fibers.
Claim 6
Dependent Claim
15 words
The composition of claim 2 wherein the flocculent is a mixture of montmorillonite and saponite.
Claim 7
Dependent Claim
9 words
A formed object of the composition of claim 1.
Claim 8
Dependent Claim
87 words
In a process for binding inorganic refractory fibers with a flocculated binder wherein said binder is selected from the group consisting of positively charged colloidal particles having a silica core coated with a polyvalent metal-oxygen compound, boehmite alumina, fumed alumina and basic aluminum chloride and the flocculent is selected from the group consisting of montmorillonite, attapulgite, saponite and hectorite, and wherein the fibers, flocculent and binders are slurried together and then filtered, the improvement comprising impregnating the wet filter cake with a negatively charged colloidal silica impregnant.
Claim 9
Dependent Claim
53 words
A process comprising the following steps: a. preparing a slurry of inorganic refractory fibers, a positively charged colloidal binder, and a negatively charged flocculent, b. filtering said slurry to form a wet compact on a filter, c. impregnating said wet compact with a negatively charged colloidal impregnant, and d. drying the impregnated compact.
Claim 10
Dependent Claim
62 words
The process of claim 10 wherein the binder is selected from the group consisting of positively charged colloidal particles having a dense silica core and a coating of polyvalent metal-oxygen compound, colloidal amorphous fumed alumina, colloidal boehmite alumina and basic aluminum chloride, the flocculent is selected from the group consisting of montmorillonite, saponite, hectorite and attapulgite, and the impregnant is colloidal silica.
Claim 11
Dependent Claim
61 words
The process of claim 10 wherein the proportion of materials used are 50 to 98 parts by weight fiber and 2 to 50 parts by weight binder plus flocculent wherein the weight ratio of binder to flocculent is from 3:1 to 1:5, and wherein the impregnant is added in an amount of from 10% to 200% by weight of the fibers.
Claim 12
Dependent Claim
24 words
The process of claim 12 in which from 30% to 150% by weight of impregnant is used based on the weight of the fibers.
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |