Granted Patent
Utility
US 5,178,491 · App. 07/717,379
Vapor-phase nutrient delivery system for in situ bioremediation of soil
Inventors:
Duane Graves, Maureen E. Leavitt
Patented Case
View Patent ↗
Granted: Jan 12, 1993
Filed: Jun 19, 1991
Inventors
Duane Graves
Maureen E. Leavitt
Assignee (at issue)
International Technology Group
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.