Granted Patent
Utility
US 4,890,960 · App. 07/255,768
Vacuum metering drum assembly
Inventor:
Elliott BROWN
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Oct 11, 1988
Inventor
Elliott BROWN
Assignee (at issue)
Raymond Production Systems 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.