Granted Patent
Utility
US 6,554,893 · App. 09/985,333
Fire door core
Inventor:
Donald F. Klus
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Nov 2, 2001
Inventor
Donald F. Klus
Assignee (at issue)
Georgia-Pacific 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.