Granted Patent
Utility
US 4,247,307 · App. 06/077,849
High intensity ionization-wet collection method and apparatus
Inventor:
Ching-Ming Chang
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Sep 21, 1979
Inventor
Ching-Ming Chang
Assignee (at issue)
Union Carbide 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.