Granted Patent
Utility
US 4,820,133 · App. 07/128,311
Axial piston compressor with discharge valving system in cast housing head
Inventors:
David Steele, Duane F. Steele
Patented Case
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Granted: Apr 11, 1989
Filed: Dec 3, 1987
Inventors
David Steele
Duane F. Steele
Assignee (at issue)
Ford Motor Company
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.