Hair straightening process and hair curling process and compositions therefor
Patent 4304244 Issued on December 8, 1981. Estimated Expiration Date: 
December 8, 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.
December 8, 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 2180380 2261094 3154470 Process for improving the quality of living, human hair by lanthionization Patent #: 3971391 InventorAssigneeApplicationNo. 05/805149 filed on 06/09/1977US Classes:132/204, Relaxing or reducing agent followed by fixing or neutralizing agent (e.g., "permanent")424/70.2, Permanent waving or straightening424/70.4Metal salt containingExaminersPrimary: 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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