Granted Patent
Utility
US 4,481,744 · App. 06/354,511
Building structure
Inventor:
Owen H. Park
Patented Case
View Patent ↗
Granted: Nov 13, 1984
Filed: Mar 3, 1982
Inventor
Owen H. Park
Assignee (at issue)
Heartland Industries, 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.