Granted Patent
Utility
US 4,560,356 · App. 06/514,442
Personal flotation device
Inventor:
J. Kelsey Burr
Patented Case
View Patent ↗
Granted: Dec 24, 1985
Filed: Jul 18, 1983
Inventor
J. Kelsey Burr
Assignee (at issue)
Halkey-Roberts 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.