Granted Patent
Utility
US 4,643,878 · App. 06/662,639
Extraction cell
Inventors:
George M. Seiter, Loren J. Klitzke, Iver L. Nelson
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Oct 18, 1984
Inventors
George M. Seiter
Loren J. Klitzke
Iver L. Nelson
Assignee (at issue)
Waldorf 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.