Granted Patent
Utility
US 4,605,396 · App. 06/704,803
Gravity flow cassette with rotary valve
Inventors:
Gus G. Tseo, Dennis L. Fitzwater
Patented Case
View Patent ↗
Granted: Aug 12, 1986
Filed: Feb 25, 1985
Inventors
Gus G. Tseo
Dennis L. Fitzwater
Assignee (at issue)
WARNER-LAMBERT COMPANY LLC
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.