Granted Patent
Utility
US 4,618,295 · App. 06/644,083
Plenum chamber flow restrictor and check valve
Inventors:
Richard H. Dugge, Jan D. Holt
Patented Case
View Patent ↗
Granted: Oct 21, 1986
Filed: Aug 24, 1984
Inventors
Richard H. Dugge
Jan D. Holt
Assignee (at issue)
ACF Industries Incorporated
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.