Granted Patent
Utility
US 4,860,694 · App. 07/242,656
Controlled discharge from a standpipe containing particulate materials
Inventor:
David J. Walker
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Sep 12, 1988
Inventor
David J. Walker
Assignee (at issue)
The Babcock & Wilcox 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.