Granted Patent
Utility
US 4,381,999 · App. 06/258,379
Automatic ultrafiltration control system
Inventors:
Terry D. Boucher, Dennis J. Hlavinka, Richard M. Kenshalo, Steven H. Johnson
Patented Case
View Patent ↗
Granted: May 3, 1983
Filed: Apr 28, 1981
Inventors
Terry D. Boucher
Dennis J. Hlavinka
Richard M. Kenshalo
Steven H. Johnson
Assignee (at issue)
Cobe Laboratories, 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.