US2590733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of stable suspensions of coal particles
Assignee: Fuel Res Corp
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Filing: 1948-08-10
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Granted: 1952-03-25
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Expires: 1968-08-10
Abstract
No abstract record available.
Inventors
- 👤 Stillman Albert Leeds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:22
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/322
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
THE METHOD OF PREPARING A STABLE SUSPENSION OF PARTICLES OF COAL IN A LIQUID MEDIUM IN WHICH SUCH PARTICLES ORDINARILY WOULD BE INCAPABLE OF REMAINING IN SUSPENSION, WHICH COMPRISES MIXING FROM 15% TO 25%, BE WEIGHT, OF SUCH COAL PARTICLES OF A SIZE NOT GREATER THAN ONEHALF A MICRON WITH A HYDROCARBONACEOUS LIQUID MEDIUM CAPABLE OF PRODUCING BROWNIAN MOVEMENT WITH SUCH PARTICLES, AND THEN WHEN SUCH MOVEMENT HAS BECOME SUFFICIENTLY INTENSE TO SUSTAIN LARGER SIZED PARTICLES IN SUCH MEDIUM, INTIMATELY DISPERSING THROUGHOUT THE MIXTURE PARTICLES OF SUCH COAL GREATER THAN ONE-HALF MINCRON IN SIZE AND AS LARGE AS BUT NOT GREATER THAN 200 MESH IN SIZE UNTIL THE COAL FORMS FROM 30% TO 60%, BY WEIGHT, OF THE COAL LIQUID MEDIUM MIXTURE.
Claim 2
Independent Claim
122 words
THE METHOD OF PREPARING A STABLE SUSPENSION OF PARTICLES OF COAL IN A LIQUID MEDIUM IN WHICH SUCH PARTICLES ORDINARILY WOULD BE INCAPABLE OF REMAINING IN SUSPENSION, WHICH COMPRISES MIXING FROM 15% TO 25%, BE WEIGHT, OF SUCH COAL PARTICLES OF A SIZE NOT GREATER THAN ONEHALF A MICRON WITH A HYDROCARBONACEOUS LIQUID MEDIUM CAPABLE OF PRODUCING BROWNIAN MOVEMENT WITH SUCH PARTICLES, AND THEN WHEN SUCH MOVEMENT HAS BECOME SUFFICIENTLY INTENSE TO SUSTAIN LARGER SIZED PARTICLES IN SUCH MEDIUM, INTIMATELY DISPERSING THROUGHOUT THE MIXTURE PARTICLES OF SUCH COAL GREATER THAN ONE-HALF MINCRON IN SIZE AND AS LARGE AS BUT NOT GREATER THAN 200 MESH IN SIZE UNTIL THE COAL FORMS FROM 30% TO 60%, BY WEIGHT, OF THE COAL LIQUID MEDIUM MIXTURE.
References Cited (Backward Citations)
US1390228A
Cited
US2231513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |