Granted Patent
Utility
US 4,360,234 · App. 05/724,549
In-situ method and apparatus for sparging gas bubbles
Inventors:
Limin Hsueh, Robert A. Hard, Donald H. Davidson, Ray V. Huff
Patented Case
View Patent ↗
Granted: Nov 23, 1982
Filed: Sep 20, 1976
Inventors
Limin Hsueh
Robert A. Hard
Donald H. Davidson
Ray V. Huff
Assignee (at issue)
Kennecott Copper 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.