US4030936A
Expired / Lapsed
US
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Binder for alumina containing refractories
Assignee: Individual
•
Filing: 1975-07-07
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Granted: 1977-06-21
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Expires: 1995-07-07
Abstract
Abstract A refractory composition is disclosed herein comprising an alumina-containing refractory mix and a phosphoric acid type binder. The binder contains sodium sulfate and aluminum sulfate in addition to phosphoric acid or its precursor such as phosphorous pentoxide.
Inventors
- 👤 Melvin M. Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:12
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/101; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6306
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
38 words
A binder for alumina based refractories, said binder consisting essentially of: H 3 po 4 : 8 moles Al 2 (SO 4 ) 3 : 0.5 to 1.5 moles Na 2 SO 4 : 0.5 to 5 moles.
Claim 2
Dependent Claim
38 words
A binder for alumina based refractories, said binder consisting essentially of: H 3 po 4 : 8 moles Al 2 (SO 4 ) 3 : 0.5 to 1.5 moles Na 2 SO 4 : 0.5 to 5 moles.
Claim 3
Dependent Claim
19 words
The binder of claim 1 wherein the Al 2 (SO 4 ) 3 is between 0.75 and 1.2 moles.
Claim 4
Dependent Claim
17 words
The binder of claim 1 wherein the Na 2 SO 4 is between 0.75 and 2.5 moles.
Claim 5
Dependent Claim
18 words
The binder of claim 1 wherein the Al 2 (SO 4 ) 3 amount is about 1 mole.
Claim 6
Dependent Claim
16 words
The binder of claim 1 wherein the Na 2 SO 4 amount is about 1 mole.
Claim 7
Dependent Claim
29 words
The binder of claim 1 wherein the Al 2 (SO 4 ) 3 level is about 1 mole and the Na 2 SO 4 level is about 1 mole.
Claim 8
Dependent Claim
63 words
A refractory mixture consisting essentially of an alumina containing mixture having between about 75 and 90 percent by weight of alumina and between 1 and 15 percent by weight of a binder consisting essentially of: H 3 po 4 : 8 moles Al 2 (SO 4 ) 3 : 0.5 to 1.5 moles Na 2 SO 4 : 0.5 moles to 5 moles.
Claim 9
Dependent Claim
63 words
A refractory mixture consisting essentially of an alumina containing mixture having between about 75 and 90 percent by weight of alumina and between 1 and 15 percent by weight of a binder consisting essentially of: H 3 po 4 : 8 moles Al 2 (SO 4 ) 3 : 0.5 to 1.5 moles Na 2 SO 4 : 0.5 moles to 5 moles.
Claim 10
Dependent Claim
64 words
A refractory mixture for forming a refractory with improved resistance to alkali attack said mixture containing a high alumina refractory mix and between about 10 and 15 percent by weight of a binder consisting essentially of: 75% H 3 PO 4 : 8 moles Al 2 (SO 4 ) 3 : 0.5 to 1.5 moles Na 2 SO 4 : 0.5 to 5 moles.
Claim 11
Dependent Claim
64 words
A refractory mixture for forming a refractory with improved resistance to alkali attack said mixture containing a high alumina refractory mix and between about 10 and 15 percent by weight of a binder consisting essentially of: 75% H 3 PO 4 : 8 moles Al 2 (SO 4 ) 3 : 0.5 to 1.5 moles Na 2 SO 4 : 0.5 to 5 moles.
Claim 12
Dependent Claim
50 words
A binder comprising an aqueous solution, said binder consisting essentially of between 15 and 27 percent by weight of aluminum sulfate, between 5 and 11 percent by weight of sodium sulfate, between 20 and 80 percent by weight of 85% phosphoric acid and the balance of said solution being water.
Claim 13
Dependent Claim
50 words
A binder comprising an aqueous solution, said binder consisting essentially of between 15 and 27 percent by weight of aluminum sulfate, between 5 and 11 percent by weight of sodium sulfate, between 20 and 80 percent by weight of 85% phosphoric acid and the balance of said solution being water.
Claim 14
Dependent Claim
38 words
The binder of claim 9 wherein said solution contains about 17% by weight of aluminum sulfate, about 7% by weight of sodium sulfate, about 32% by weight of 85% phosphoric acid and about 44% by weight of water.
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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |