Granted Patent
Utility
US 6,591,449 · App. 09/958,171
Caster assemblies
Inventor:
John Richard Parkin
Patented Case
View Patent ↗
Granted: Jul 15, 2003
Filed: Mar 22, 2002
Inventor
John Richard Parkin
Assignee (at issue)
APW 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.