Granted Patent
Utility
US 4,239,728 · App. 06/006,248
Apparatus and method for the diffusion of substances between two fluids separated by a semipermeable membrane
Inventors:
Kaj O. Stenberg, Lars J. C. Traven
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Jan 24, 1979
Inventors
Kaj O. Stenberg
Lars J. C. Traven
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.