Granted Patent
Utility
US 4,861,352 · App. 07/139,462
Method of separating a gas and/or particulate matter from a liquid
Inventor:
Alan Cheng
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Dec 30, 1987
Inventor
Alan Cheng
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.