Granted Patent
Utility
US 6,538,360 · App. 10/029,751
Multiple frequency cleaning system
Inventor:
William L. Puskas
Patented Case
View Patent ↗
Granted: Mar 25, 2003
Filed: Oct 29, 2001
Inventor
William L. Puskas
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.