Permanent wave system using ammonium bisulfite prewrap
Patent 4214596 Issued on July 29, 1980. Estimated Expiration Date: 
July 31, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 31, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2351718 2615828 2836185 3472604 3533417 InventorsAssigneeApplicationNo. 05/929326 filed on 07/31/1978US Classes:132/204, Relaxing or reducing agent followed by fixing or neutralizing agent (e.g., "permanent")424/70.4, Metal salt containing424/70.5Sulfur compound containingExaminersPrimary: McNeill, G. E.Attorney, Agent or FirmInternational ClassesA45D 7/04 (20060101)A45D 7/00 (20060101) AbstractThis invention relates to an improvement in the method of treating hair in which water wet hair is wrapped around rollers, a mercaptan-containing solution is applied to the hair on the rollers, and the mercaptan-wetted hair is thereafter neutralized with an oxidizing agent. This improvement comprises wetting the hair prior to wrapping it with an aqueous solution of a prewrap agent selected from the group consisting of alkali metal and ammonium sulfites and alkali metal and ammonium bisulfites. These prewrap agents are present at about 0.1 to about 1.0 Molar, at a pH of about 6.5 to about 7.5 and cleave no more than about 5 percent of the hair disulfide bonds before the mercaptan-containing solution is applied.Other References
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