Granted Patent
Utility
US 4,587,890 · App. 06/723,424
Air filtration system for harvester operator cab
Inventor:
Joseph C. Hurlburt
Patented Case
View Patent ↗
Granted: May 13, 1986
Filed: Apr 15, 1985
Inventor
Joseph C. Hurlburt
Assignee (at issue)
Sperry Corp.
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.