Granted Patent
Utility
US 5,447,500 · App. 08/129,932
Collar and cartridge-needle unit assembly
Inventors:
William A. Bergstresser, Mark Stiehl, John J. Niedospial, Jr.
Patented Case
View Patent ↗
Granted: Sep 5, 1995
Filed: Sep 29, 1993
Inventors
William A. Bergstresser
Mark Stiehl
John J. Niedospial, Jr.
Assignee (at issue)
Sterling Winthrop 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.