Granted Patent
Utility
US 3,976,138 · App. 05/622,615
Method of increasing permeability in subsurface earth formation
Inventors:
Patrick Joseph Colpoys, Jr., Eugene Allen Neel, Jr.
Patented Case
View Patent ↗
Granted: Aug 24, 1976
Filed: Oct 15, 1975
Inventors
Patrick Joseph Colpoys, Jr.
Eugene Allen Neel, Jr.
Assignee (at issue)
Union Carbide Corporation
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.