Granted Patent
Utility
US 6,607,666 · App. 09/917,527
Mud tank cleaning system
Inventor:
Robert C. Rajewski
Patented Case
View Patent ↗
Granted: Aug 19, 2003
Filed: Jul 27, 2001
Inventor
Robert C. Rajewski
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.