Hair straightening process and hair curling process and compositions therefor
Patent 4373540 Issued on February 15, 1983. Estimated Expiration Date: 
December 8, 2000. 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.
December 8, 2000. 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 2794440 2836543 Shampoo compositions which impart high luster and manageability to hair Patent #: 3960782 InventorAssigneeApplicationNo. 06/214023 filed on 12/08/1980US Classes:132/204, Relaxing or reducing agent followed by fixing or neutralizing agent (e.g., "permanent")424/70.2Permanent waving or straighteningExaminersPrimary: McNeill, G. E.Attorney, Agent or FirmInternational ClassA45D 7/00 (20060101)AbstractCompositions and methods for curling hair and for straightening hair are disclosed, wherein the compositions contain, as the principal active ingredient thereof, guanidine hydroxide. The guanidine hydroxide may be conveniently prepared by reacting calcium hydroxide and guanidine carbonate.Hair is curled by contacting the hair with the composition while the hair is on curlers, or otherwise maintained in a curled configuration. After the desired treatment time, the hair is rinsed and neutralized, with long lasting curls of the so-called "permanent wave" nature resulting.Hair may be straightened by contacting the hair with the composition and maintaining the hair in a generally straight configuration over at least a portion of the time that the hair is contacted by the composition. Thereafter the hair may be rinsed and neutralized.Other References
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