Granted Patent
Utility
US 4,255,940 · App. 06/065,016
Discharge line filter-dryer
Inventors:
Darwin R. Grahl, Walter O. Krause
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Aug 9, 1979
Inventors
Darwin R. Grahl
Walter O. Krause
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.