Granted Patent
Utility
US 5,961,438 · App. 09/052,637
Method and apparatus for the injection disposal of solid and liquid waste materials into subpressured earth formations penetrated by a borehole
Inventors:
W. Thomas Ballantine, Albert H. D. Alexander, Leland D. Lakey, Frank L. Lyon, Stephen Marinello
Patented Case
View Patent ↗
Granted: Oct 5, 1999
Filed: Mar 31, 1998
Inventors
W. Thomas Ballantine
Albert H. D. Alexander
Leland D. Lakey
Frank L. Lyon
Stephen Marinello
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.