US4336339A
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High zirconia fused refractory product
Assignee: AGC Inc
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Filing: 1981-02-23
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Granted: 1982-06-22
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Expires: 2001-02-23
Abstract
Abstract A high zirconia fused refractory product consists essentially of the following constituents analytically, on a weight basis: 85% to 97% of ZrO2; 0.1% to 3% of P2O5; 2% to 10% of SiO2; up to 3% of Al2O3 without a substantial amount of a rare earth oxide.
Inventors
- 👤 Masataro Okumiya
- 👤 Kiyoharu Kuwabara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:32
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/42; C03B5/43; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/482; C04B35/622; C04B35/653; C04B35/657
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
A high zirconia fused refractory product consisting essentially of the following constituents analytically, on a weight basis: 85% to 97% of ZrO 2 ; 0.1% to 3% of P 2 O 5 ; 2% to 10% of SiO 2 ; up to 3% of Al 2 O 3 ; and being full of rare earth oxide.
Claim 2
Dependent Claim
56 words
A high zirconia fused refractory product consisting essentially of the following constituents analytically, on a weight basis: 85% to 97% of ZrO 2 ; 0.1% to 3% of P 2 O 5 ; 2% to 10% of SiO 2 ; up to 3% of Al 2 O 3 ; and being full of rare earth oxide.
Claim 3
Dependent Claim
24 words
The high zirconia fused refractory product according to claim 1 wherein the content of Al 2 O 3 is less than 1% by weight.
Claim 4
Dependent Claim
44 words
The high zirconia fused refractory product according to claim 1 or 2, wherein a content of an impurity beside ZrO 2 , P 2 O 5 , Al 2 O 3 , SiO 2 and Na 2 O is less than 1% by weight.
Claim 5
Dependent Claim
22 words
The high zirconia fused refractory product according to claim 3 wherein a content of the impurity is less than 0.5% by weight.
Claim 6
Dependent Claim
22 words
The high zirconia fused refractory product according to claim 4 wherein a content of the impurity is less than 0.1% by weight.
Claim 7
Dependent Claim
63 words
A high zirconia fused refractory product consisting essentially of the following constituents analytically, on a weight basis: 85% to 97% of ZrO 2 ; 0.1% to 3% of P 2 O 5 ; 2% to 10% of SiO 2 ; up to 3% of Al 2 O 3 ; less than 1% of alkali metal oxide and being free of rare earth oxide.
Claim 8
Dependent Claim
63 words
A high zirconia fused refractory product consisting essentially of the following constituents analytically, on a weight basis: 85% to 97% of ZrO 2 ; 0.1% to 3% of P 2 O 5 ; 2% to 10% of SiO 2 ; up to 3% of Al 2 O 3 ; less than 1% of alkali metal oxide and being free of rare earth oxide.
Claim 9
Dependent Claim
78 words
A high zirconia fused refractory product consisting essentially of the following constituents analytically, on a weight basis: 90% to 96% of ZrO 2 ; 0.1% to 3% of P 2 O 5 ; 3% to 6% of SiO 2 ; less than 1% of Al 2 O 3 ; less than 0.6% of alkali metal oxide; less than 0.5% of alkaline earth metal oxide +Fe 2 O 3 +TiO 2 ; and being free of rare earth oxide.
Claim 10
Dependent Claim
78 words
A high zirconia fused refractory product consisting essentially of the following constituents analytically, on a weight basis: 90% to 96% of ZrO 2 ; 0.1% to 3% of P 2 O 5 ; 3% to 6% of SiO 2 ; less than 1% of Al 2 O 3 ; less than 0.6% of alkali metal oxide; less than 0.5% of alkaline earth metal oxide +Fe 2 O 3 +TiO 2 ; and being free of rare earth oxide.
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) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |