Granted Patent
Utility
US 5,358,690 · App. 07/814,447
Environmental sample collection and membrane testing device
Inventor:
Raouf A. Guirguis
Patented Case
View Patent ↗
Granted: Oct 25, 1994
Filed: Dec 30, 1991
Inventor
Raouf A. Guirguis
Assignee (at issue)
LaMina, 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.