Granted Patent
Utility
US 4,823,680 · App. 07/129,748
Wide laminar fluid doors
Inventor:
Mark S. Nowotarski
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Dec 7, 1987
Inventor
Mark S. Nowotarski
Assignee (at issue)
Union Carbide Corporation
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.