Granted Patent
Utility
US 4,189,263 · App. 05/932,028
Sparger outlet having sparger loop valve assembly
Inventors:
John A. Krug, John W. Matthews
Patented Case
View Patent ↗
Granted: Feb 19, 1980
Filed: Aug 8, 1978
Inventors
John A. Krug
John W. Matthews
Assignee (at issue)
ACF Industries Incorporated
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.