Granted Patent
Utility
US 5,297,547 · App. 07/922,132
Laryngeal mask construction
Inventor:
Archibald Ian Jeremy Brain
Patented Case
View Patent ↗
Granted: Mar 29, 1994
Filed: Jul 30, 1992
Inventor
Archibald Ian Jeremy Brain
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.