Granted Patent
Utility
US 4,231,875 · App. 05/902,353
Diffusion apparatus utilizing tubular semi-permeable membrane
Inventors:
Per-Olov Carlsson, Kaj O. Stenberg
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: May 3, 1978
Inventors
Per-Olov Carlsson
Kaj O. Stenberg
Assignee (at issue)
Gambro AB
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.