Granted Patent
Utility
US 5,212,921 · App. 07/950,790
Door sill composition
Inventor:
Kirby L. Unruh
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Sep 24, 1992
Inventor
Kirby L. Unruh
Assignee (at issue)
Marvin Lumber and Cedar Company, 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.