Appeal No. 1996-0941
Application 08/091,421
contain 37-41% alumina indicates that the alumina content
range of high alumina cements is not that of aluminous cements
as disclosed by Barnes, i.e., from below 40% to over 80%.
The examiner points out that Branski uses the term “iron-
containing aluminous cements” (col. 1, line 46) and Crocker
uses the term “expansive ettringite forming sulfoalumina
cement” (col. 1, lines 51-52), and argues that these
disclosures indicate that “aluminous cement” is broader than
“high alumina cement” (answer, page 8). The examiner has not
explained, however, and it is not apparent, why these
disclosures indicate that one of ordinary skill in the art
would not have considered a sulfoalumina cement to be an
aluminous cement.
Appellant has provided a dictionary definition (McGraw-
Hill, page 73) which states: “aluminate cement . . . Also
known as aluminous cement; high alumina cement; high speed
cement.” Appellant also relies upon European Standard EN 197-
10 which states:
NOTE 2: Calcium aluminate cement has previously been
known by several alternatives in other countries:
- high alumina cement;
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