Granted Patent
Utility
US 4,454,078 · App. 06/205,378
Mixing systems having agitators for mixing gas with liquid
Inventors:
Horst P. Engelbrecht, Ronald J. Weetman
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Nov 10, 1980
Inventors
Horst P. Engelbrecht
Ronald J. Weetman
Assignee (at issue)
Federal Signal 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.