Granted Patent
Utility
US 6,644,592 · App. 09/961,698
Floatation system
Inventors:
David G. Parrott, Don V. Hitzfield
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Sep 21, 2001
Inventors
David G. Parrott
Don V. Hitzfield
Assignee (at issue)
Apical Industries, 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.