Granted Patent
Utility
US 6,095,531 · App. 09/042,830
Hand truck with stair tread roller assembly
Inventor:
Zareh Khachatoorian
Patented Case
View Patent ↗
Granted: Aug 1, 2000
Filed: Mar 17, 1998
Inventor
Zareh Khachatoorian
Assignee (at issue)
Olympia Industrial, 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.