Appeal No. 2006-2247
Reexamination Nos. 90/006,554 and 90/006,894
1 not; conversion of the N-oxide to the hydrohalide thus provides
2 a simple technique for obtaining a pure product by
3 recrystallization techniques. [Column 7, lines 38-52.]
4
5 27. In Example V, Witman describes a process in which: (a) 31.6 parts of
6 pyridine, 20 parts water, and 5.0 parts of molybdic anhydride were
7 mixed together and heated to 60°C; (b) 32.8 parts of 50% by weight
8 hydrogen peroxide was added over a ten minute period; (c) the
9 temperature of the reaction mixture was maintained at 60-65°C for
10 two hours until all of the peroxide was consumed; (d) 4.0 parts of
11 calcium hydroxide were added and the temperature of the reaction
12 mixture was allowed to cool to room temperature with continued
13 stirring; (e) the insoluble salts were filtered; (f) 50 parts of
14 concentrated HCl were added to the filtrate; and (g) the solution was
15 then freed of water by distillation at 10-15 mm Hg to provide 34.3
16 parts of the hydrochloride salt of the pyridine N-oxide (63% yield).
17 (Column 8, lines 60-75.)
18 28. The ‘684 patent under reexamination states that the catalysts
19 described in Witman, including acids of molybdenum, are preferred
20 catalysts suitable for use in the claimed invention. (Column 2, line 43
21 to column 3, line 5.)
9
Page: Previous 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Next
Last modified: November 3, 2007