Granted Patent
Utility
US 4,610,218 · App. 06/714,714
Apparatus for intimately contacting particulate solids with a heavy liquid
Inventors:
Steven W. Johnson, Alden W. Olsen
Patented Case
View Patent ↗
Granted: Sep 9, 1986
Filed: Mar 21, 1985
Inventors
Steven W. Johnson
Alden W. Olsen
Assignee (at issue)
Atlantic Richfield Company
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.