Granted Patent
Utility
US 4,957,731 · App. 07/340,194
Hair processing additives
Inventors:
Michael W. Helioff, Carmen D. Bires, Robert B. Login
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Apr 19, 1989
Inventors
Michael W. Helioff
Carmen D. Bires
Robert B. Login
Assignee (at issue)
GAF Chemicals Corporation
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.