Hair care perming agent
Patent 5690956 Issued on November 25, 1997. Estimated Expiration Date: 
September 27, 2015. 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.
September 27, 2015. 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 ReferencesPhosphorus activators for percompounds Patent #: 4145305 InventorAssigneeApplicationNo. 534296 filed on 09/27/1995US Classes:424/450, Liposomes424/70.2Permanent waving or straighteningExaminersPrimary: Page, Thurman K.Assistant: Sikha, Murthy Attorney, Agent or FirmForeign Patent References
International ClassA61K 009/127AbstractStrong reducing chemicals are required by prior art to break disulfide bonds of hair structure in alkaline media. The disulfide bonds are responsible for holding the hair in set condition.This disclosure teaches a new means for breaking the disulfide bonds by use of Tris-(2-carboxyethyl) phosphine (TCEP) in a mildly acid solution.The essence of the specification is the breaking of disulfide bonds in an acid environment. | |
