Granted Patent
Utility
US 5,069,286 · App. 07/516,177
Method for prevention of well fouling
Inventors:
L. Frederick Roensch, Kelvin Y. Chang, Clarence T. Tanner
Patented Case
View Patent ↗
Granted: Dec 3, 1991
Filed: Apr 30, 1990
Inventors
L. Frederick Roensch
Kelvin Y. Chang
Clarence T. Tanner
Assignee (at issue)
The Mogul 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.