Granted Patent
Utility
US 5,330,541 · App. 07/970,253
Method for salt-free dyeing
Inventors:
David M. Hall, Tony M. Leonard, Charles D. Cofield, Hugh W. Barrow
Patented Case
View Patent ↗
Granted: Jul 19, 1994
Filed: Dec 15, 1992
Inventors
David M. Hall
Tony M. Leonard
Charles D. Cofield
Hugh W. Barrow
Assignee (at issue)
American Emulsions Inc.
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.