Granted Patent
Utility
US 4,449,967 · App. 06/389,313
Conveyor flight configuration
Inventor:
John W. Caldwell
Patented Case
View Patent ↗
Granted: May 22, 1984
Filed: Jun 17, 1982
Inventor
John W. Caldwell
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.