Granted Patent
Utility
US 4,113,552 · App. 05/712,033
Elutriation leg and method
Inventors:
Frank Bella, Jr., Richard C. Bennett
Patented Case
View Patent ↗
Granted: Sep 12, 1978
Filed: Aug 5, 1976
Inventors
Frank Bella, Jr.
Richard C. Bennett
Assignee (at issue)
Whiting Corporation
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.