Granted Patent
Utility
US 4,994,050 · App. 07/429,892
Float chamber and sleeve for use in a chest drainage device
Inventors:
Eugene E. Weilbacher, F. Thane DeWeese
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Oct 31, 1989
Inventors
Eugene E. Weilbacher
F. Thane DeWeese
Assignee (at issue)
Sherwood Medical Company
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.