Granted Patent
Utility
US 4,123,383 · App. 05/834,163
Silica based defoamer compositions having improved stability
Inventor:
Frederick J. Ihde, Jr.
Patented Case
View Patent ↗
Granted: Oct 31, 1978
Filed: Sep 19, 1977
Inventor
Frederick J. Ihde, Jr.
Assignee (at issue)
Diamond Shamrock 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.