US3867158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicate glass from blast furnace slag
Assignee: Calumite Co
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Filing: 1973-02-14
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Granted: 1975-02-18
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Expires: 1993-02-14
Abstract
Abstract Glass and new glass-like products are provided which may have unique compositions and properties and are adapted for use in producing a wide variety of products which may be clear or transparent in color and capable of use in the manufacture of sheet materials, containers, fibers, glazes, and other ceramic articles. The compositions may be manufactured in a conventional glass furnace from a mixture of ingredients, the major portion of which may be a slag from which at least a portion of the sulfur and/or iron or both have been removed. The resulting products are glasses which may be composed primarily of the silicates of calcium, magnesium and aluminum or combinations thereof.
Inventors
- 👤 John O Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:15
CPC Classifications
C; C21; C21B; C21B3/00; C21B3/04; C21B3/06; C03; C03C; C03C1/00; C03C1/002; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C04; C04B; C04B5/00; C21B2400/00; C21B2400/02; C21B2400/022; Y; Y02; Y02W; Y02W30/00; Y02W30/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
THE METHOD OF PRODUCING A TRANSPARENT GLASS WHICH CONSISTS MELTING A MIXTURE OF GLASS FORMING MATERIALS CONSISTING ESSENTIALLY OF SAND, FROM ABOUT 20% TO 500% OF REFINED SLAG BASED UPON THE WEIGHT OF THE SAND IN THE MIXTURE, AND FROM ABOUT 16 TO 100% BASED ON THE WEIGHT OF THE SAND IN THE MIXTURE OF AN AGENT SELECTED FROM THE GROUP CONSISTING OF THE SULFATES AND CARBONATES OF SODIUM AND CALCIUM AND MIXTURES THEREOF, SAID REFINED SLAG BEING A BLAST FURNACE SLAG CONTAINING LESS THAN 0.3% BY WEIGHT OF SULFUR.
Claim 2
Independent Claim
90 words
THE METHOD OF PRODUCING A TRANSPARENT GLASS WHICH CONSISTS MELTING A MIXTURE OF GLASS FORMING MATERIALS CONSISTING ESSENTIALLY OF SAND, FROM ABOUT 20% TO 500% OF REFINED SLAG BASED UPON THE WEIGHT OF THE SAND IN THE MIXTURE, AND FROM ABOUT 16 TO 100% BASED ON THE WEIGHT OF THE SAND IN THE MIXTURE OF AN AGENT SELECTED FROM THE GROUP CONSISTING OF THE SULFATES AND CARBONATES OF SODIUM AND CALCIUM AND MIXTURES THEREOF, SAID REFINED SLAG BEING A BLAST FURNACE SLAG CONTAINING LESS THAN 0.3% BY WEIGHT OF SULFUR.
Claim 3
Dependent Claim
24 words
The method as defined in claim 1 wherein said mixture of a glass forming materials also includes slag compositions other than said refined slag.
Claim 4
Dependent Claim
24 words
The method as defined in claim 1 wherein said mixture contains a sulfate selected from the group consisting of gypsum, barytes and salt cake.
Claim 5
Dependent Claim
28 words
The method as defined in claim 1 wherein said mixture contains an amount of a sulfate compound substantially equal to the weight of the sand in the mixture.
Claim 6
Dependent Claim
36 words
The method as defined in claim 1 wherein said mixture consists essentially of about 2000 parts by weight of refined slag, about 326 parts by weight of sand and about 326 parts by weight of gypsum.
Claim 7
Dependent Claim
25 words
The method as defined in claim 1 wherein said refined slag contains about 0.03% or less of sulfur and about 0.3% or less of iron.
Claim 8
Dependent Claim
108 words
A transparent glass product resulting from the fusion in a glass furnace of a mixture of glass forming materials consisting essentially of sand, from about 20% to 500% based on the weight of the sand of blast furnace slag containing less than 0.3% sulfur, and from about 16% to 100% based on the weight of the sand of an agent selected from the group consisting of the sulfates and carbonates of sodium and calcium and mixtures thereof, said glass product having a SiO2 content not exceeding about 50% and an alkali content not exceeding about 5%, and having a coefficient of expansion less than 80 X 10 7
Claim 9
Dependent Claim
108 words
A transparent glass product resulting from the fusion in a glass furnace of a mixture of glass forming materials consisting essentially of sand, from about 20% to 500% based on the weight of the sand of blast furnace slag containing less than 0.3% sulfur, and from about 16% to 100% based on the weight of the sand of an agent selected from the group consisting of the sulfates and carbonates of sodium and calcium and mixtures thereof, said glass product having a SiO2 content not exceeding about 50% and an alkali content not exceeding about 5%, and having a coefficient of expansion less than 80 X 10 7
Claim 10
Dependent Claim
16 words
A glass product as defined in claim 7 having an SiO2 content of less than 50%.
Claim 11
Dependent Claim
15 words
A glass product as defined in claim 7 which contains substantially no lead or boron.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |