Granted Patent
Utility
US 4,848,400 · App. 07/158,194
Rotary fluid coupling
Inventors:
Robert W. Grant, Bruce Mackedanz
Patented Case
View Patent ↗
Granted: Jul 18, 1989
Filed: Feb 19, 1988
Inventors
Robert W. Grant
Bruce Mackedanz
Assignee (at issue)
FSI INTERNATIONAL, 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.