US4381348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blue colored artificial stone stocks and method of manufacturing the same
Assignee: JFE Engineering Corp
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Filing: 1981-12-28
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Granted: 1983-04-26
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Expires: 2001-12-28
Abstract
Abstract A low cost beautiful blue colored artificial stone stock is obtained by using a high carbon or low carbon slag formed at the time of preparing ferrochromium, as it is or after incorporated with an expensive addition. The stone stock has a composition of 40-70% by weight of SiO2, 0.1-5% by weight of a low grade chromium oxide and the balance of CaO, MgO and Al2O3.
Inventors
- 👤 Toshio Kamatani
- 👤 Hirohisa Ishiguro
- 👤 Kensei Itakura
- 👤 Kazuo Yamagishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:54
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0063; C03C1/00; C03C1/002; C03C10/0036; C03C10/0045; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C04; C04B; C04B32/00; C04B32/005; C04B5/00; C04B5/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
39 words
A blue colored artificial stone stock containing 40-70% by weight of SiO 2 , 0.1-5% by weight of chromium oxide having an oxidation number up to 2 and the balance of CaO, MgO and Al 2 O 3 .
Claim 2
Dependent Claim
39 words
A blue colored artificial stone stock containing 40-70% by weight of SiO 2 , 0.1-5% by weight of chromium oxide having an oxidation number up to 2 and the balance of CaO, MgO and Al 2 O 3 .
Claim 3
Dependent Claim
47 words
A blue colored artificial stone stock containing 40-70% by weight of SiO 2 , 0.1-5% by weight of chromium oxide having an oxidation number up to 2, 5-15% by weight of CaO, 17-23% by weight of MgO and 6-20% by weight of Al 2 O 3 .
Claim 4
Dependent Claim
47 words
A blue colored artificial stone stock containing 40-70% by weight of SiO 2 , 0.1-5% by weight of chromium oxide having an oxidation number up to 2, 5-15% by weight of CaO, 17-23% by weight of MgO and 6-20% by weight of Al 2 O 3 .
Claim 5
Independent Claim
106 words
A method of manufacturing a blue colored artificial stone stock comprising the steps of: preparing a raw material selected from the group consisting of a high carbon ferrochromium slag, a low carbon ferrochromium slag and a silicochromium slag and mixture thereof; adding SiO 2 and a reducing agent to said raw material; melting the resulting mixture; adjusting the composition of the molten mixture so that it contains 40 to 70% by weight of SiO 2 and 0.1 to 5% by weight of chromium oxide having an oxidation number up to 2; and then slowly cooling the molten mixture to form said blue colored artificial stone stock.
Claim 6
Independent Claim
106 words
A method of manufacturing a blue colored artificial stone stock comprising the steps of: preparing a raw material selected from the group consisting of a high carbon ferrochromium slag, a low carbon ferrochromium slag and a silicochromium slag and mixture thereof; adding SiO 2 and a reducing agent to said raw material; melting the resulting mixture; adjusting the composition of the molten mixture so that it contains 40 to 70% by weight of SiO 2 and 0.1 to 5% by weight of chromium oxide having an oxidation number up to 2; and then slowly cooling the molten mixture to form said blue colored artificial stone stock.
Claim 7
Dependent Claim
19 words
The method according to claim 3 wherein said cooling is effected at a rate of less than 10° C./min.
Claim 8
Independent Claim
102 words
A method of manufacturing a blue colored artificial stone stock comprising the steps of: preparing a raw material mixture of a chromium containing mineral, a silicon containing mineral and a reducing agent; the quantity of Cr 2 O 3 in said raw material being 4-8% by weight and the quantity of said reducing agent being 1.4-1.8 times the stoichiometric quantity necessary to reduce said Cr 2 O 3 to CrO; melting said raw material to form a molten mixture; and adjusting the composition of said molten mixture so that it contains 40-70% by weight SiO 2 and 0.7-1.9% by weight total chromium.
Claim 9
Independent Claim
102 words
A method of manufacturing a blue colored artificial stone stock comprising the steps of: preparing a raw material mixture of a chromium containing mineral, a silicon containing mineral and a reducing agent; the quantity of Cr 2 O 3 in said raw material being 4-8% by weight and the quantity of said reducing agent being 1.4-1.8 times the stoichiometric quantity necessary to reduce said Cr 2 O 3 to CrO; melting said raw material to form a molten mixture; and adjusting the composition of said molten mixture so that it contains 40-70% by weight SiO 2 and 0.7-1.9% by weight total chromium.
Claim 10
Dependent Claim
44 words
The method according to claim 5 wherein when said raw material contains an iron oxide, and the quantity of said reducing agent is 1.4-1.8 times the stoichiometric quantity necessary to reduce said Cr 2 O 3 and said iron oxide to CrO and Fe.
Claim 11
Dependent Claim
20 words
The method according to claim 5 wherein said raw material comprises a slag formed at the time of preparing ferrochromium.
Claim 12
Dependent Claim
14 words
The method according to claim 5 or 6 wherein said reducing agent comprises coke.
Claim 13
Dependent Claim
33 words
The method of claim 3 wherein said molten mixture contains between 48 and 60% SiO 2 , and between 0.3 and 3% of said chromium oxide, and wherein said reducing agent comprises coke.
Claim 14
Dependent Claim
30 words
The blue colored artificial stone stock according to claim 1 or 2 which contains between 48 and 60% SiO 2 , and between 0.3 and 3% of said chromium oxide.
References Cited (Backward Citations)
JPS53138411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |