Granted Patent
Utility
US 6,056,012 · App. 09/257,569
Inline check valve
Inventors:
Kaye Kit-Han Yuen, Ronald D. Jungmann, Scott R. Olson
Patented Case
View Patent ↗
Granted: May 2, 2000
Filed: Feb 25, 1999
Inventors
Kaye Kit-Han Yuen
Ronald D. Jungmann
Scott R. Olson
Assignee (at issue)
ECOLAB 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.