Granted Patent
Utility
US 5,460,331 · App. 08/261,438
Apparatus for dispersion of sludge in a crude oil storage tank
Inventors:
Richard W. Krajicek, Robert R. Cradeur
Patented Case
View Patent ↗
Granted: Oct 24, 1995
Filed: Jun 17, 1994
Inventors
Richard W. Krajicek
Robert R. Cradeur
Assignee (at issue)
Servi-Tech, 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.