Granted Patent
Utility
US 6,208,913 · App. 08/999,932
Chemical injection system
Inventors:
Stephen E. Marshall, Mark Zeck
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: Aug 18, 1997
Inventors
Stephen E. Marshall
Mark Zeck
Assignee (at issue)
YZ Systems, 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.