Granted Patent
Utility
US 4,883,474 · App. 07/062,844
Thoracic catheter
Inventors:
David S. Sheridan, Ralph D. Alley
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Jun 16, 1987
Inventors
David S. Sheridan
Ralph D. Alley
Assignee (at issue)
David R. Sheridan
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.