Fuel and related compositions – Coal treating process or product thereof
Reexamination Certificate
2004-03-29
2009-08-25
Toomer, Cephia D (Department: 1797)
Fuel and related compositions
Coal treating process or product thereof
C156S078000, C264S029100, C264S029600, C423S448000
Reexamination Certificate
active
07578860
ABSTRACT:
According to the present invention there is provided a coal-based carbon foam having a density of between about 0.1 g/cm3and about 0.8 g/cm3, preferably between about 0.2 g/cm3and about 0.6 g/cm3and most preferably between about 0.3 g/cm3and about 0.4 g/cm3that is produced by the controlled heating of high volatile bituminous coal particulate in a “mold” and under a non-oxidizing atmosphere. The high volatile bituminous coal starting material preferably exhibits a free swell Index of between about 3.5 and about 5.0 and most preferably between about 3.75 and about 4.5. A number of additional highly desirable characteristics of the high volatile bituminous coal starting material are also described. The carbon foam product thereby produced can be machined, adhered and otherwise fabricated to produce a wide variety of low cost, low density products, or used in its preformed shape as a filter, beat or electrical insulator etc. Such carbon foams, without further treatment exhibit compressive strengths of up to about 6000 psi. Further treatment by carbonization or graphitization yields products that can be used as electrical or heat conductors. Methods for the production of these coal-based cellular products are also described.
REFERENCES:
patent: 3309437 (1967-03-01), Harnett
patent: 4127391 (1978-11-01), Koppelman
patent: 6656239 (2003-12-01), Rogers et al.
patent: 6749652 (2004-06-01), Rogers
patent: 14899690 (1977-10-01), None
patent: 08112876 (1996-05-01), None
ULTRAFOAMc Open-cell carbon foam; http://www.ultramet.com/8.htm.
Lane Philip D.
Toomer Cephia D
Touchstone Research Laboratory, Ltd.
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