Appeal No. 2006-2413 Page 3
Application No. 10/250,412
Discussion
1. Claim construction
Claims 3-19, 21-23, 25-40, and 52-56 are pending and on appeal. The
independent claims are claims 27 and 54-56, which read as follows:
27. An aqueous cementitious mixture comprising:
a. Portland cement;
b. water;
c. a predominantly negatively-charged polyelectrolyte comprising a
negatively-charged repeat unit; and
d. a predominantly positively-charged polyelectrolyte comprising a positively-
charged repeat unit;
wherein the water and Portland cement are present in the aqueous cementitious
mixture in a weight ratio of about 1:3 to about 3:5, respectively.
54. A process for forming an aqueous cementitious mixture with increased
viscosity during its working state, the process comprising
forming an aqueous cementitious mixture comprising water, Portland cement, a
predominantly negatively-charged polyelectrolyte and a predominantly positively-
charged polyelectrolyte, the water and Portland cement being in a weight ratio of about
1:3 to about 3:5, respectively, wherein
(i) the water, Portland cement and, optionally, one of the predominantly
negatively-charged and predominantly positively-charged polyelectrolytes are mixed to
form an initial mixture, and
(ii) the viscosity of the initial mixture is increased by adding one or both of the
predominantly negatively-charged polyelectrolyte and the predominantly positively-
charged polyelectrolyte to the initial mixture to form the aqueous cementitious mixture.
55. A process for forming an aqueous cementitious mixture with increased
viscosity, the process comprising
mixing a predominantly negatively-charged polyelectrolyte with Portland cement
to form a dry mix; and
combining the dry mix with water and a predominantly positively-charged
polyelectrolyte in a compressed gas spraying apparatus to form the aqueous
cementitious mixture.
56. A process for forming an aqueous cementitious mixture with increased
viscosity, the process comprising
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