Granted Patent
Utility
US 5,489,313 · App. 08/238,211
Method for salt-free dyeing
Inventors:
David M. Hall, Tony M. Leonard, Charles D. Cofield, Hugh W. Barrow
Patented Case
View Patent ↗
Granted: Feb 6, 1996
Filed: May 2, 1994
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.