Granted Patent
Utility
US 4,888,974 · App. 07/306,003
Control valve for a mandrel collection system
Inventor:
Russell F. Mandell
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Feb 2, 1989
Inventor
Russell F. Mandell
Assignee (at issue)
Emhart Industries, 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.