Appeal No. 95-1360
Application No. 08/134,002
2 3
Nos. 4,419,136 and 4,798,628. RHHC is recent
terminology for cements such as those in the cited
patents.
On these facts, we hold that “rapid hardening hydraulic
cement” is a term of art and defines cement “based on Calcium
sulphoaluminate compound” (Specification, p. 2, lines 32-33).
Having determined the meaning of “rapid hardening
hydraulic cement,” it is necessary to determine whether
Watanabe suggests using the claimed additive package in a
rapid hardening hydraulic cement. According to Watanabe (col.
5, lines 48-60):
The cements to which the cement additive of the
present invention may be added include various
Portland cements, mixed cements and hydraulic
materials containing slag particles as essential
components. The rapid hardening Portland cement is
not effective in view of high strength since it
contains alumina cement, 12CaO.7Al O ,
2 3
11CaO.7Al O .CaF or amorphous calcium aluminate
23 2
including CaO.Al O , 12CaO 7Al O , etc. as well as23
2 2 3
2 U.S. Patent No. 4,419,136 to Rice discloses an
expansive cement containing a calcium alumino sulfate
compound.
3 U.S. Patent No. 4,798,628 to Mills et al. discloses
a settable cementitious composition produced by mixing a
ground mineral composition containing the phase
4CaO.3Al O .SO , in the presence of water, with a source of
2 3 3
alkali metal or alkaline earth metal under alkaline
conditions.
7
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