Granted Patent
Utility
US 5,447,183 · App. 08/185,035
Vacuum fill system
Inventor:
Norwin C. Derby
Patented Case
View Patent ↗
Granted: Sep 5, 1995
Filed: Dec 13, 1993
Inventor
Norwin C. Derby
Assignee (at issue)
B.A.G. Corp.
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.