Granted Patent
Utility
US 6,142,160 · App. 09/316,680
Method for dispersing and removing sludge contained in a storage tank
Inventors:
M. Craig Winslow, Larry J. Weber
Patented Case
View Patent ↗
Granted: Nov 7, 2000
Filed: May 21, 1999
Inventors
M. Craig Winslow
Larry J. Weber
Assignee (at issue)
Betzdearborn, 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.