Granted Patent
Utility
US 4,377,493 · App. 06/277,630
Defoamer composition and use thereof
Inventors:
Francis J. Boylan, Clemmon Porter, Olga Bruno
Patented Case
View Patent ↗
Granted: Mar 22, 1983
Filed: Jun 26, 1981
Inventors
Francis J. Boylan
Clemmon Porter
Olga Bruno
Assignee (at issue)
Drew Chemical 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.