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US 5,205,300 AGranted
Method for determining effectiveness of relaxer treatment
AssigneeRevlon Consumer Products Corporation
InventorsGeoffrey R. Hawkins, Clyde B. Simpson, Jr., Gustave J. Klein
Life of this patent
Estimating the term…
Abstract
A method for determining the effectiveness of hair relaxer treatments immediately after treatment, and a method for determining the amount of curl reversion at specified time periods after relaxer treatment.
Claims12
A method for determining the effectiveness of a hair relaxer treatment comprising the steps of:
- a) Cutting a representative sample of hair from a subject's head prior to relaxer treatment,
- b) Gently stretching the hair until straight and cutting a sample of a predetermined length,
- c) allowing the hair sample of (b) to contract to its natural configuration and measuring the length,
- d) treating the subject's hair with relaxer,
- e) cutting a representative sample of hair from the subject's head after relaxer treatment,
- f) gently stretching the hair until straight and cutting a sample of the same predetermined length as in (b),
- g) allowing the hair sample of (f) to contract to its natural configuration and measuring the length,
- h) determining the percent relaxation according to the formula:
- ##EQU8##
6 more elements
Dependencies are inferred from the claim text.