Granted Patent
Utility
US 4,960,475 · App. 07/496,008
Surfactant for gassed emulsion explosive
Inventors:
Don H. Cranney, Blake T. Maxfield
Patented Case
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Granted: Oct 2, 1990
Filed: Mar 20, 1990
Inventors
Don H. Cranney
Blake T. Maxfield
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.