Granted Patent
Utility
US 4,835,327 · App. 06/938,495
Method for producing 1,2,4-trichlorobenzene
Inventors:
Joseph E. Milam, William E. Wimer
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Dec 5, 1986
Inventors
Joseph E. Milam
William E. Wimer
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.