Granted Patent
Utility
US 4,637,849 · App. 06/771,863
Waterproof ammonium nitrate fuel oil explosives
Inventor:
William F. Harris
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Sep 3, 1985
Inventor
William F. Harris
Assignee (at issue)
Celanese GmbH
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.