Granted Patent
Utility
US 4,945,933 · App. 07/180,334
Liquid circulator useful for dispersing sediment contained in a storage tank
Inventors:
Richard W. Krajicek, Robert R. Cradeur
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Apr 11, 1988
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.