Granted Patent
Utility
US 4,649,913 · App. 06/757,426
Tracheostomy tube assemblies
Inventor:
Jeremy Watson
Patented Case
View Patent ↗
Granted: Mar 17, 1987
Filed: Jul 8, 1985
Inventor
Jeremy Watson
Assignee (at issue)
Smiths Industries Public Limited Company
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.