Granted Patent
Utility
US 5,004,571 · App. 07/516,775
Liquid level control in gas-liquid mixing operations
Inventors:
Lawrence M. Litz, Mark K. Weise, David A. Haid
Patented Case
View Patent ↗
Granted: Apr 2, 1991
Filed: Mar 30, 1990
Inventors
Lawrence M. Litz
Mark K. Weise
David A. Haid
Assignee (at issue)
Union Carbide Industrial Gases Technology 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.