Granted Patent
Utility
US 5,226,749 · App. 07/910,381
Waste disposal in hydraulically fractured earth formations
Inventor:
Thomas K. Perkins
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Jul 8, 1992
Inventor
Thomas K. Perkins
Assignee (at issue)
Atlantic Richfield 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.