Patent US4352701A successfully refreshed from Google Patents.
Patent US3759730A successfully refreshed from Google Patents.
US3759730A
Expired / Lapsed
US
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Process for utilizing coal residues
Assignee: Individual
•
Filing: 1971-04-30
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Granted: 1973-09-18
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Expires: 1991-04-30
Abstract
Abstract COAL RESIDUES SUCH AS POWER STATION ASH OR MINING WASTE PRODUCTS, ARE MIXED WITH CALCIUM CARBONATE AND FIRED AT ABOUT 1300*C. THE FIRED MIXTURE IS THEN HEATED TO AT LEAST ABOUT 1500*C. TO TRANSFORM IT TO A MOLTEN SLAG. THE MOLTEN SLAG IS QUENCHED FROM ABOUT 1500*C. TO FORM GRANULES WHICH ARE COMMINUTED TO GET A PURE HYDRAULIC BINDER INTO WHICH IS INCORPORATED A SETTING AND HARDENING AGENT.
Inventors
- 👤 L Trief
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:43
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/24; C04B7/28; Y; Y02; Y02P; Y02P40/00; Y02P40/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |