Granted Patent
Utility
US 5,839,252 · App. 08/835,143
Metal door with continuous frame and method
Inventors:
David M. Berghorn, Shaojun Gao
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Apr 4, 1997
Inventors
David M. Berghorn
Shaojun Gao
Assignee (at issue)
THE STANLEY WORKS LTD
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.