Granted Patent
Utility
US 4,501,924 · App. 06/490,818
Herbicidally active substituted diphenyl ether acetals or ketals
Inventor:
Dennis K. Krass
Patented Case
View Patent ↗
Granted: Feb 26, 1985
Filed: May 2, 1983
Inventor
Dennis K. Krass
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.