Granted Patent
Utility
US 4,214,593 · App. 05/943,445
Esophageal pressure monitoring device
Inventors:
Richard P. Imbruce, Nelson E. Leatherman
Patented Case
View Patent ↗
Granted: Jul 29, 1980
Filed: Sep 18, 1978
Inventors
Richard P. Imbruce
Nelson E. Leatherman
Assignee (at issue)
MALLINCKRODT LLC
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.