Granted Patent
Utility
US 5,833,718 · App. 08/664,065
Sodium potassium sulfide composition and method for preparing same
Inventors:
Fred Abraham, Frank E. Gilmore, II
Patented Case
View Patent ↗
Granted: Nov 10, 1998
Filed: Jun 13, 1996
Inventors
Fred Abraham
Frank E. Gilmore, II
Assignee (at issue)
PPG Industries, 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.