Granted Patent
Utility
US 4,275,021 · App. 05/778,797
Gas-liquid contacting tray with improved inlet bubbling means
Inventors:
Robert D. Kirkpatrick, David W. Weiler
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Mar 17, 1977
Inventors
Robert D. Kirkpatrick
David W. Weiler
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.