Granted Patent
Utility
US 4,273,240 · App. 06/006,908
Variable pitch sprockets for conveyor system
Inventor:
Robert W. Selleck
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Jan 26, 1979
Inventor
Robert W. Selleck
Assignee (at issue)
BECTON, DICKINSON AND 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.