Granted Patent
Utility
US 4,348,784 · App. 06/161,861
Swivel type caster with seal and lubrication ring
Inventor:
Frank J. Fontana
Patented Case
View Patent ↗
Granted: Sep 14, 1982
Filed: Jun 23, 1980
Inventor
Frank J. Fontana
Assignee (at issue)
Stewart Warner Corporation
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.