Appeal 2007-2236
Application 10/991,738
1 Layer 14 is made from what Rupich calls a precursor solution.
2 The precursor solution includes:
3 (1) a salt of a rare earth metal;
4 (2) a salt of an alkaline earth metal;
5 (3) a salt of a transition metal; and
6 (4) a solvent.
7 Publication ¶ 0046.
8 A process for making the precursor and using it to form layer 14 is
9 described at great lengths. Publication ¶¶ 0080 through 0098.
10 When a salt of the rare earth metal yttrium [Y], a salt of the alkaline
11 earth metal barium [Ba], a salt of the transition metal copper [Cu], all
12 dissolved in an alcohol [e.g., methanol—CH3OH as shown in Example I],
13 are used to make layer 14, the layer ends up being an oxide having the
14 empirical formula YBa2Cu3O7-x. Publication ¶¶ 0011, last sentence, 0100
15 and 0165—part of Example I.
16 A property of layer 14 is "high critical current density." Publication
17 ¶¶ 0011 and 0104.
18 According to Rupich, layer 14 (1) "preferably" has a critical current
19 density of at least about 0.5 x 106 Amperes per square centimeter, (2) "more
20 preferably" at least about 1 x 106 Amperes per square centimeter and (3)
21 "most preferably" 2 x 106 Amperes per square centimeter, all as determined
22 by transport measurement at 77ºK in self field using a 1 microVolt per
23 centimeter criterion. Publication ¶ 0104.
24 Another characteristic of layer 14 is the thickness of layer 14.
5
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