Granted Patent
Utility
US 4,403,684 · App. 06/219,228
Fluid shear coupling apparatus
Inventor:
Paul J. Haeck
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Dec 22, 1980
Inventor
Paul J. Haeck
Assignee (at issue)
Wallace Murray 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.