Patents by Inventor Adu G. Darkwa

Adu G. Darkwa 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).

  • Conditioning hair relaxer system
    Patent number: 5376364
    Abstract: A conditioning activator for a no-lye hair relaxer and a conditioning hair relaxer system includes a conditioning agent which is a water-soluble cationic compound. In a preferred embodiment the cationic conditioning agent is a cationic polymer. Also disclosed are methods for preparing phase-stable no-lye cream bases suitable for conditioning hair relaxer systems.
    Type: Grant
    Filed: October 30, 1991
    Date of Patent: December 27, 1994
    Assignee: Johnson Products Co., Inc.
    Inventors: Adu G. Darkwa, Florine Newell
  • Hair relaxer and post-relaxer hair brightener system
    Patent number: 5293885
    Abstract: A hair relaxer and post-relaxer hair brightener system and method is disclosed which overcomes the undesirable alteration of the natural tone of hair, especially of naturally gray hair, by highly-alkaline hair-relaxing systems. The natural tone of such alkali-relaxed hair is desirably brightened, enhanced and restored in a hair brightening step by certain disclosed post-relaxer aqueous hair brightener compositions which contain an active hair brightening agent. In a particularly preferred embodiment, the hair brightening agent comprises a relatively low active concentration of hydrogen peroxide.
    Type: Grant
    Filed: July 11, 1991
    Date of Patent: March 15, 1994
    Assignee: Johnson Products Co., Inc.
    Inventors: Adu G. Darkwa, Apolonio Villanueva, III
  • Conditioning hair relaxer system with conditioning activator
    Patent number: 5077042
    Abstract: A conditioning activator for a no-lye hair relaxer and a conditioning hair relaxer system includes a conditioning agent which is a water-soluble cationic compound. In a preferred embodiment the cationic conditioning agent is a cationic polymer. Also disclosed are methods for preparing phase-stable no-lye cream bases suitable for conditioning hair relaxer systems.
    Type: Grant
    Filed: September 22, 1989
    Date of Patent: December 31, 1991
    Assignee: Johnson Products Co., Inc.
    Inventors: Adu G. Darkwa, Florine Newell