Granted Patent
Utility
US 4,623,793 · App. 06/472,547
Device and method for determining skin type
Inventors:
Fred Hofke, Irwin Margolin
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Mar 7, 1983
Inventors
Fred Hofke
Irwin Margolin
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.