Granted Patent
Utility
US 6,773,639 · App. 09/973,086
Method of and system for forming a fire door core
Inventors:
Hartley Moyes, Michael Windsor Symons
Patented Case
View Patent ↗
Granted: Aug 10, 2004
Filed: Oct 10, 2001
Inventors
Hartley Moyes
Michael Windsor Symons
Assignee (at issue)
Premdor International, Inc.
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.