There are too many patterns and many are "conditional" (dependent on the prior day and the position in the week, and whether it is a bull move or a bear move). The basic pattern is, in bear markets (which we still are in) a lull just before noon, a run through about 1:30 to 2:20, and then often a repeat of whatever the first hour pattern was. Mind you, that pattern works, maybe 60% of the time. Big gap up or down have a tendency of changing this basic patterns, and from time to time you get a continuous pattern (ramping all day or dumping all day).
Zeev
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