Granted Patent
Utility
US 4,331,147 · App. 06/164,923
System for draining wounds
Inventor:
Lee C. Armstrong
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Jul 1, 1980
Inventor
Lee C. Armstrong
Assignee (at issue)
Glasrock Products, 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.