Granted Patent
Utility
US 4,556,143 · App. 06/554,451
Conveyor
Inventor:
Peter Andrew Johnson
Patented Case
View Patent ↗
Granted: Dec 3, 1985
Filed: Nov 22, 1983
Inventor
Peter Andrew Johnson
Assignee (at issue)
Figgie Inernational Inc.
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.