Patent US3879208A successfully refreshed from Google Patents.
US3879208A
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Refractory composition
Assignee: NATIONAL REFRACTORIES & MINERALS Corp A CORP OF
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Filing: 1974-02-19
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Granted: 1975-04-22
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Expires: 1994-02-19
Abstract
Abstract A refractory composition suitable for forming a monolithic structure by ramming, gunning, or casting is made from sized refractory aggregate, preferably nonacid aggregate, containing at least 10% grain with an MgO content of at least 50% and passing a 100 mesh screen, together with aluminum sulfate, an organic acid or salt thereof, for example citric acid or a citrate, with or without the addition of a boron compound, preferably a soluble boron compound such as borax or boric acid.
Inventors
- 👤 Jr Nicholas Cassens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/01; C04B35/03; C04B35/04; C04B35/043; C04B35/047; C04B35/0476; C04B35/632; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
64 words
A REFRACTORY COMPOSITION CONSISTING ESSENTIALLY SIZED REFRACTORY AGGREGATE INCLUDING AT LEAST 10% BASED ON THE TOTAL WEIGHT OF THE COMPOSITION, MGO-CONTAINING GRAIN HAVING AT LEAST 50% MGO AND PASSING A 100 MESH SCREEN, FROM 0.1 TO 1.5%, ON THE DEHYDRATED BASIS, ALUMINUM SULFATE, FROM 0.2 TO 1.5% OF AN ORGANIC ACID OR SALT THEREOF, AND UP TO 1%, EXPRESSED AS B2O3, OF BORON COMPOUND.
Claim 2
Dependent Claim
64 words
A REFRACTORY COMPOSITION CONSISTING ESSENTIALLY SIZED REFRACTORY AGGREGATE INCLUDING AT LEAST 10% BASED ON THE TOTAL WEIGHT OF THE COMPOSITION, MGO-CONTAINING GRAIN HAVING AT LEAST 50% MGO AND PASSING A 100 MESH SCREEN, FROM 0.1 TO 1.5%, ON THE DEHYDRATED BASIS, ALUMINUM SULFATE, FROM 0.2 TO 1.5% OF AN ORGANIC ACID OR SALT THEREOF, AND UP TO 1%, EXPRESSED AS B2O3, OF BORON COMPOUND.
Claim 3
Dependent Claim
66 words
A refractory composition consisting essentially of sized refractory aggregate including at least 10%, based on the total weight of the composition, MgO-containing grain having at least 50% MgO and passing a 100 mesh screen, from 0.1 to 1.5%, on the dehydrated basis, aluminum sulfate, from 0.2 to 1.5% of an organic acid or salt thereof, and up to 1%, expressed as B2O3, of a boron compound.
Claim 4
Dependent Claim
66 words
A refractory composition consisting essentially of sized refractory aggregate including at least 10%, based on the total weight of the composition, MgO-containing grain having at least 50% MgO and passing a 100 mesh screen, from 0.1 to 1.5%, on the dehydrated basis, aluminum sulfate, from 0.2 to 1.5% of an organic acid or salt thereof, and up to 1%, expressed as B2O3, of a boron compound.
Claim 5
Dependent Claim
36 words
Composition according to claim 1 wherein the aluminum sulfate is hydrated aluminum sulfate, wherein the boron compound is a soluble boron compound, and wherein the organic acid or salt thereof is citric acid or a citrate.
Claim 6
Dependent Claim
14 words
Composition according to claim 2 wherein the MgO-containing grain contains at least 85% MgO.
Claim 7
Dependent Claim
17 words
Composition according to claim 3 wherein the refractory aggregate is all grain containing at least 85% MgO.
Claim 8
Dependent Claim
14 words
Composition according to claim 2 wherein the aluminum sulfate contains 14 waters of hydration.
Claim 9
Dependent Claim
14 words
Composition according to claim 5 wherein the MgO-containing grain contains at least 85% MgO.
Claim 10
Dependent Claim
17 words
Composition according to claim 6 wherein all the refractory aggregate is grain containing at least 85% MgO.
Claim 11
Dependent Claim
14 words
Composition according to claim 2 wherein the boron compound is boric acid or borax.
Claim 12
Dependent Claim
14 words
Composition according to claim 8 wherein the MgO-containing grain contains at least 85% MgO.
Claim 13
Dependent Claim
17 words
Composition according to claim 9 wherein all the refractory aggregate is grain containing at least 85% MgO.
Claim 14
Dependent Claim
14 words
Composition according to claim 5 wherein the boron compound is boric acid or borax.
Claim 15
Dependent Claim
14 words
Composition according to claim 11 wherein the MgO-containing grain contains at least 85% MgO.
Claim 16
Dependent Claim
17 words
Composition according to claim 12 wherein all the refractory aggregate is grain containing at least 85% MgO.
Claim 17
Dependent Claim
14 words
Composition according to claim 11 wherein the citric acid or citrate is citric acid.
Claim 18
Dependent Claim
14 words
Composition according to claim 14 wherein the MgO-containing grain contains at least 85% MgO.
Claim 19
Dependent Claim
17 words
Composition according to claim 15 wherein all the refractory aggregate is grain containing at least 85% MgO.
Claim 20
Dependent Claim
12 words
Composition according to claim 11 wherein the boron compound is boric acid.
Claim 21
Dependent Claim
14 words
Composition according to claim 17 wherein the MgO-containing grain contains at least 85% MgO.
Claim 22
Dependent Claim
17 words
Composition according to claim 18 wherein all the refractory aggregate is grain containing at least 85% MgO.
Claim 23
Dependent Claim
14 words
Composition according to claim 17 wherein the citric acid or citrate is citric acid.
Claim 24
Dependent Claim
14 words
Composition according to claim 20 wherein the MgO-containing grain contains at least 85% MgO.
Claim 25
Dependent Claim
15 words
Composition according to claim 21 wherein all the refractory aggregate is grain containing 85% MgO.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |