Granted Patent
Utility
US 5,144,986 · App. 07/675,699
One way flow device
Inventor:
Terrence M. Drew
Patented Case
View Patent ↗
Granted: Sep 8, 1992
Filed: Mar 27, 1991
Inventor
Terrence M. Drew
Assignee (at issue)
Alden 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.