Granted Patent
Utility
US 4,317,724 · App. 06/152,749
Feeding device for use in filter presses
Inventor:
Donald E. Bardsley
Patented Case
View Patent ↗
Granted: Mar 2, 1982
Filed: May 23, 1980
Inventor
Donald E. Bardsley
Assignee (at issue)
Ingersoll-Rand 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.