Granted Patent
Utility
US 4,880,564 · App. 07/099,034
Antifoams for aqueous systems and their use
Inventors:
Heinz Abel, Christian Guth, Hans-Ulrich Berendt
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Sep 21, 1987
Inventors
Heinz Abel
Christian Guth
Hans-Ulrich Berendt
Assignee (at issue)
Ciba-Geigy
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.