Coating processes – With post-treatment of coating or coating material – Heating or drying
Reexamination Certificate
2007-05-22
2007-05-22
Le, H. T. (Department: 1773)
Coating processes
With post-treatment of coating or coating material
Heating or drying
C427S222000
Reexamination Certificate
active
10774319
ABSTRACT:
A method for making hollow spheres of alumina or aluminate comprises: coating polymeric beads with an aqueous solution of an alumoxane, drying the beads so as to form an alumoxane coating on the beads; heating the beads to a first temperature that is sufficient to convert the alumoxane coating to an amorphous alumina or aluminate coating and is not sufficient to decompose the polymeric beads; dissolving the polymeric bead in a solvent; removing the dissolved polymer from the amorphous alumina or aluminate coating; and heating the amorphous alumina or aluminate coating to a second temperature that is sufficient to form a hollow ceramic sphere of desired porosity and strength. The hollow spheres can be used as proppants or can be incorporated in porous membranes.
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Barron Andrew R.
DeFriend Kimberly A.
Conley & Rose, P.C.
Le H. T.
William Marsh Rice University
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