Granted Patent
Utility
US 4,416,656 · App. 06/366,102
Hard surfacing for a centrifuge conveyor
Inventor:
Leonard Shapiro
Patented Case
View Patent ↗
Granted: Nov 22, 1983
Filed: Apr 6, 1982
Inventor
Leonard Shapiro
Assignee (at issue)
Pennwalt Corporation
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.