Granted Patent
Utility
US 4,282,413 · App. 06/054,299
Liquid flow indicator
Inventors:
John R. Simons, John W. Fenske
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: Jul 2, 1979
Inventors
John R. Simons
John W. Fenske
Assignee (at issue)
Grunau Company, 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.