Granted Patent
Utility
US 4,156,438 · App. 05/850,567
Mixing valve
Inventor:
Lutz A. Kiesow
Patented Case
View Patent ↗
Granted: May 29, 1979
Filed: Nov 11, 1977
Inventor
Lutz A. Kiesow
Assignee (at issue)
Baxter Travenol Laboratories, 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.