Granted Patent
Utility
US 4,331,023 · App. 06/129,138
Addition and measurement of gases dissolved in molten metals
Inventors:
Ties Allersma, James E. Simpson
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Mar 10, 1980
Inventors
Ties Allersma
James E. Simpson
Assignee (at issue)
PPG Industries, Inc.
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.