Granted Patent
Utility
US 4,619,764 · App. 06/622,163
Repelling-action filter unit and assembly
Inventors:
John F. Church, Walter H. Stone, Richard E. Schaupp
Patented Case
View Patent ↗
Granted: Oct 28, 1986
Filed: Jun 19, 1984
Inventors
John F. Church
Walter H. Stone
Richard E. Schaupp
Assignee (at issue)
Parker-Hannifin 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.