Granted Patent
Utility
US 6,527,512 · App. 09/797,336
Mud motor
Inventors:
Robert Bertin, William D. Nielsen, Diane Ryan
Patented Case
View Patent ↗
Granted: Mar 4, 2003
Filed: Mar 1, 2001
Inventors
Robert Bertin
William D. Nielsen
Diane Ryan
Assignee (at issue)
BRUSH WELLMAN, INC.
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.