Granted Patent
Utility
US 4,273,188 · App. 06/145,368
In situ combustion process for the recovery of liquid carbonaceous fuels from subterranean formations
Inventors:
Roger F. Vogel, Ajay Madhav Madgavkar, Harold E. Swift
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Apr 30, 1980
Inventors
Roger F. Vogel
Ajay Madhav Madgavkar
Harold E. Swift
Assignee (at issue)
Gulf Research & Development Company
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.