prov:value
| - S6723308Nov 2, 2001Apr 20, 2004Kenra, LlcPre-straightening the hair, first removing a residue from the previous straightening treatment, treating with an aqueous solution including an acids and an amphoteric surfactantUS6805136Nov 2, 2001Oct 19, 2004Kenra, LlcApplying hydroxide of calcium, barium, sodium, lithium, and/or potassium with guanidine carbonate to straightene hairUS7008917 *Jun 15, 2004
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