Granted Patent
Utility
US 4,235,229 · App. 06/047,824
Adjustable tracheostomy tube assembly
Inventors:
Alan B. Ranford, Fred E. Satchell
Patented Case
View Patent ↗
Granted: Nov 25, 1980
Filed: Jun 6, 1979
Inventors
Alan B. Ranford
Fred E. Satchell
Assignee (at issue)
Sherwood Medical Industries Inc.
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.