Granted Patent
Utility
US 5,944,288 · App. 09/022,971
Constant support pipe hanger
Inventors:
Norman Whitney, Frank J. Birch
Patented Case
View Patent ↗
Granted: Aug 31, 1999
Filed: Feb 13, 1998
Inventors
Norman Whitney
Frank J. Birch
Assignee (at issue)
Grinnell 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.