Granted Patent
Utility
US 4,324,234 · App. 06/152,002
Dual chamber personal flotation device
Inventor:
Samuel Gene Maness
Patented Case
View Patent ↗
Granted: Apr 13, 1982
Filed: May 21, 1980
Inventor
Samuel Gene Maness
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.