US3830639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of colored glass
Assignee: Calumite Co
•
Filing: 1974-01-16
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Granted: 1974-08-20
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Expires: 1994-01-16
Abstract
Abstract Colored glass is produced from a mixture of glass making ingredients including boiler slag compositions which may contain little or no sulfur but contain substantial amounts of iron, manganese or other metals required to produce the desired glass colorants. In this way the amount of sulfide and sulfate compounds employed in the glass forming mix can be limited and a significant reduction in sulfur dioxide and other fumes and pollutants discharged from the glass making furnace is effected. At the same time the stability of the glass produced is improved and a greater uniformity in color is assured.
Inventors
- 👤 R Evans
- 👤 D Myers
- 👤 W Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:27
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/02; C03C1/00; C03C1/002; C03C1/10; C03C14/00; C03C14/006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
23 words
The method as defined in claim 1 wherein said boiler slag contains from about 5 percent to 50 percent by weight of iron.
Claim 2
Dependent Claim
27 words
The method as defined in claim 1 wherein said sulfur containing material comprises a blast furnace slag containing up to about 5 percent by weight of sulfur.
Claim 3
Dependent Claim
20 words
The method as defined in claim 1 wherein said mixture of glass forming materials is substantially free of sulfate compounds.
Claim 4
Dependent Claim
32 words
The method as defined in claim 1 wherein the amount of boiler slag present in the mixture is from about 1 to 25 pounds per ton of sand present in the mixture.
Claim 5
Dependent Claim
36 words
The method as defined in claim 1 wherein said sulfur containing composition comprises a blast furnace slag and is present in an amount up to about 400 pounds per ton of sand present in the mixture.
Claim 6
Dependent Claim
44 words
The method as defined in claim 1 wherein said mixture contains from about 150 to 350 pounds of blast furnace slag and from about 10 to 40 pounds of boiler slag per ton of sand in the mixture and contains substantially no sulfate compounds.
Claim 7
Dependent Claim
24 words
The method as defined in claim 1 wherein said mixture consists essentially of sand, soda ash, limestone, blast furnace slag, boiler slag and carbon.
Claim 8
Dependent Claim
19 words
The method as defined in claim 1 wherein said mixtures has approximately the following composition in parts by weight:
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |