Patents by Inventor Syed Pervaiz

Syed Pervaiz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of rating hair damage
    Patent number: 5131417
    Abstract: A method of obtaining a hair damage rating is obtained by determining the change in hair structure, such as measuring the amount of free sulfhydryl groups after hair treatment or exposure to agents, comparing this with a number of such groups before treatment to obtain a percentage change, establishing a rating scale having a range of percentage change values, and selecting the hair damage factor a number corresponding to the determined percentage change after treatment.
    Type: Grant
    Filed: November 14, 1991
    Date of Patent: July 21, 1992
    Inventors: Nardo Zaias, Syed Pervaiz