Granted Patent
Utility
US 4,140,735 · App. 05/824,375
Process and apparatus for bubbling gas through a high purity liquid
Inventor:
John C. Schumacher
Patented Case
View Patent ↗
Granted: Feb 20, 1979
Filed: Aug 15, 1977
Inventor
John C. Schumacher
Assignee (at issue)
J.C. Schumacher Co.
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.