Granted Patent
Utility
US 6,782,917 · App. 09/983,321
Reciprocating cone anti-drainback apparatus
Inventors:
James B. Wolford, Joseph A. Geisler, Mitchell Kujawski
Patented Case
View Patent ↗
Granted: Aug 31, 2004
Filed: Oct 24, 2001
Inventors
James B. Wolford
Joseph A. Geisler
Mitchell Kujawski
Assignee (at issue)
SPX 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.