Granted Patent
Utility
US 4,929,244 · App. 07/240,317
Baffle system for use in underwater drainage devices
Inventor:
David Rork Swisher
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Sep 2, 1988
Inventor
David Rork Swisher
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.