Granted Patent
Utility
US 4,631,145 · App. 06/612,871
Defoamer and antifoamer composition and method for defoaming aqueous fluid systems
Inventor:
Craig Zychal
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: May 22, 1984
Inventor
Craig Zychal
Assignee (at issue)
Amoco 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.