Appeal No. 94-4409
Application 07/958,526
rejection of claims 40 through 43, 45, 47, 48, 57 through 62,
64, 66 through 75, and 87. Claims 49 through 56, 76 through
80, 84, 85 and 88 through 92 are allowed. Claims 81 through
83 and 86 are objected to but are also considered allowable.
The subject matter on appeal is directed to certain
drilling fluid compositions and processes for forming and
using the drilling fluids in a bore hole wherein ?hostile
conditions? are encountered. To illustrate the invention and
to show further details thereof, representative claims 40, 45,
and 66 are reproduced below:
40. A process comprising forming a drilling fluid
comprising clay and a polymer produced from a monomer
composition consisting essentially of at least one hydrophilic
N-vinyl lactam and at least one hydrophilic unsaturated amide
selected from the group consisting of monomers represented by
the formulas,
O
R? - C - NH2
where R? is an unsaturated radical and
H R’ O
HC = C - C - NR’2
2
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