Granted Patent
Utility
US 4,352,644 · App. 06/148,696
Air-hydraulic pump
Inventors:
Michael T. Landrum, Terrance Anderson
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: May 12, 1980
Inventors
Michael T. Landrum
Terrance Anderson
Assignee (at issue)
Owatonna Tool 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.