Appeal No. 96-2800
Application 08/149,042
This is an appeal from the final rejection of claims 1-11
and 15-22, all the pending claims in the application.
The subject matter relates to an unleaded aviation
gasoline composition. Claim 1 is illustrative of the appealed
claims and reads as follows:
1. An unleaded aviation gasoline composition which
comprises:
(a) from 85 to 92 volume percent of aviation alkylate;
(b) from 4 to 10 volume percent of at least one ether
selected from methyl tertiary-butyl ether, ethyl tertiary-
butyl ether, methyl tertiary-amyl ether, and mixtures of any
two or all three of the foregoing ethers;
(c) from zero to 10 volume percent of one or more other
hydrocarbons falling in the aviation gasoline boiling range;
and
(d) from 0.25 to 0.6 gram of manganese per gallon as one or
more cyclopentadienyl manganese tricarbonyl compounds;
wherein the sum of the amounts of (a) and (b), and also of (c)
if present, is 100 volume percent; with the proviso that (a),
(b) and (d), and also (c) if present, are proportioned such
that said composition has (i) an ASTM D 2382 heat of
combustion of at least 18,000 BTU per pound, and (ii) a
minimum knock value lean rating octane number of 100 as
determined by ASTM Test Method D 2700 and wherein motor method
octane ratings are converted to aviation ratings in the manner
described in ASTM Specification D 910-90.
The references relied on by the examiner are:
Carmody 2,391,084 Dec. 18, 1945
Evans et al. (Evans) 2,409,746 Oct. 22, 1946
Brown et al. (Brown '351) 3,127,351 Mar. 31, 1964
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