Granted Patent
Utility
US 4,343,705 · App. 06/202,478
Biological liquid fractionation using alternate opposite flow directions across a membrane
Inventor:
Kenneth D. Legg
Patented Case
View Patent ↗
Granted: Aug 10, 1982
Filed: Oct 31, 1980
Inventor
Kenneth D. Legg
Assignee (at issue)
Instrumentation Laboratory 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.