Granted Patent
Utility
US 4,530,830 · App. 06/562,268
Quaternary ammonium hydroxide hair relaxer composition
Inventors:
William McKaba, Clyde B. Simpson, Jr.
Patented Case
View Patent ↗
Granted: Jul 23, 1985
Filed: Dec 16, 1983
Inventors
William McKaba
Clyde B. Simpson, Jr.
Assignee (at issue)
Revlon
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.