Granted Patent
Utility
US 4,397,189 · App. 06/258,381
Measuring low flowrates
Inventors:
Steven H. Johnson, Thomas P. Grover, Richard M. Kenshalo
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Apr 28, 1981
Inventors
Steven H. Johnson
Thomas P. Grover
Richard M. Kenshalo
Assignee (at issue)
Cobe 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.