Granted Patent
Utility
US 5,599,688 · App. 08/506,049
Device and method for circulating fluid over a membrane
Inventor:
George M. Grass
Patented Case
View Patent ↗
Granted: Feb 4, 1997
Filed: Jul 24, 1995
Inventor
George M. Grass
Assignee (at issue)
Precision Instrument Design
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.