US3822799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing blast furnace slag products
Assignee: Calumite Co
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Filing: 1972-01-07
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Granted: 1974-07-09
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Expires: 1992-01-07
Abstract
Abstract A blast furnace slag product adapted for use in the manufacture of glass is produced by depositing successive loads of slag each having a composition within a predetermined range, in spaced locations within a storage area so as to produce a layer composed of numerous individual loads each differing more or less in composition within said range. Several such layers are arranged one upon another after which the material required for use is removed from the storage area in a direction transverse to said layers and the material thus removed is ground and subjected to magnetic separation whreby a product of highly uniform composition is obtained.
Inventors
- 👤 R Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:32
CPC Classifications
C; C21; C21B; C21B3/00; C21B3/04; C21B3/06; C21B3/08; C03; C03C; C03C1/00; C03C1/002; C21B2400/00; C21B2400/02; C21B2400/022
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
36 words
The method as defined in claim 1 wherein from three to 10 layers of slag are placed one upon another before the stored slag is removed to obtain a quantity of slag to be further treated.
Claim 2
Dependent Claim
21 words
The method as defined in claim 1 wherein the slags selected for use each have a composition within the following limits:
Claim 3
Dependent Claim
22 words
The method as defined in claim 1 wherein each layer of slag is made up of at least 15 portions of slag.
Claim 4
Dependent Claim
33 words
The method as defined in claim 1 wherein each portion of the slag in a layer thereof is surrounded by other portions of slag having a somewhat different composition within said predetermined limits.
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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |