Appeal 2007-0511
Application 10/699,508
1 3. O’Rear
2 O’Rear discloses a blend of lube base oils which provide improved
3 oxidation stability, both with and without additives. O’Rear, para. [0001].
4 According to O’Rear, para. [0002]:
5 Finished lubricants used for automobiles, diesel engines,
6 and industrial applications consist of two general components:
7 a lube base oil and additives. In general, a few lube base oils
8 are used to generate a wide variety of finished lubricants by
9 varying the mixtures of individual lube base oils and individual
10 additives. This requires that lube base oils be stored without
11 additives prior to use. Also, lube base oils are an item of
12 commerce and are bought, sold and exchanged. Since the
13 receiver of the lube base oil wants to formulate specific finished
14 lubes, they do not want to receive lube base oils that already
15 contain additives. Thus, lube base oils in almost all
16 circumstances do not contain additives, and are simply
17 hydrocarbons prepared from petroleum or other sources. Thus
18 one general requirement for a lube base oil is that it have good
19 stability during shipment and storage in the absence of
20 additives. In addition, it is desirable that the finished lubricant
21 have as good a stability as possible. In this case, the stability is
22 the resistance to oxidation and formation of deposits during
23 shipment and storage in the presence of additives and other
24 compounds that simulate use in commercial equipment. The
25 preferred lube base oil is one that has a combination of good
26 stability without additives and with additives.
27
28 The lube base oil disclosed in O’Rear may be used in a finished
29 lubricant composition and, thus, may contain one or more additives,
30 depending on the particular use of the oil. O’Rear, para. [0046].
31 O’Rear discloses that the additives are used in amounts which are
32 known to those of skill in the art, preferably about 0.1 to about 40 weight
33 percent of the final lube oil product. O’Rear, para. [0046].
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