Granted Patent
Utility
US 4,998,396 · App. 07/504,488
Interlocking panels
Inventor:
Michael J. Palmersten
Patented Case
View Patent ↗
Granted: Mar 12, 1991
Filed: Apr 4, 1990
Inventor
Michael J. Palmersten
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.