Granted Patent
Utility
US 4,884,723 · App. 07/363,441
Hard gasket for retrofit installation on hopper outlet/hopper gasket outlet
Inventor:
Richard H. Dugge
Patented Case
View Patent ↗
Granted: Dec 5, 1989
Filed: Jun 7, 1989
Inventor
Richard H. Dugge
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.