Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
2011-07-12
2011-07-12
Le, Hoa (Department: 1788)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
C428S404000, C428S406000, C501S153000
Reexamination Certificate
active
07976949
ABSTRACT:
One embodiment of the present invention relates to spherical ceramic elements, such as proppants, for maintaining permeability in subterranean formations to facilitate extraction of oil and gas therefrom. The strength of the ceramic element may be enhanced by combining materials having different coefficients of thermal expansion. Methods of making the ceramic elements are also disclosed.
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Dickson Kevin R.
Fuss Tihana
Stephens Walter T.
Field, III Thomas G.
Fraser Stewart A.
Le Hoa
Saint-Gobain Ceramics & Plastics, Inc.
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