Granted Patent
Utility
US 6,463,625 · App. 09/740,020
Door truck with a one piece frame and low friction wheels
Inventor:
Douglas C. Mittag
Patented Case
View Patent ↗
Granted: Oct 15, 2002
Filed: Dec 20, 2000
Inventor
Douglas C. Mittag
Assignee (at issue)
Richards-Wilcox, 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.