Granted Patent
Utility
US 4,466,434 · App. 06/440,269
Offset mouthpiece structure for underwater breathing
Inventor:
Lois H. Brownstein
Patented Case
View Patent ↗
Granted: Aug 21, 1984
Filed: Dec 30, 1982
Inventor
Lois H. Brownstein
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.