Granted Patent
Utility
US 6,640,382 · App. 10/037,907
Mobile filter cleaning system
Inventors:
Richard P. Williams, David H. Shupe, Thomas M. Holman, Keith Blair
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Nov 9, 2001
Inventors
Richard P. Williams
David H. Shupe
Thomas M. Holman
Keith Blair
Assignee (at issue)
Filter-Medic, LLC
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.