Granted Patent
Utility
US 5,161,339 · App. 07/680,644
Tile/carpet trim for trench duct
Inventor:
John P. Penczak
Patented Case
View Patent ↗
Granted: Nov 10, 1992
Filed: Apr 2, 1991
Inventor
John P. Penczak
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.