Granted Patent
Utility
US 4,822,351 · App. 07/030,441
Powder spike holder
Inventor:
Bradford P. Purcell
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Mar 25, 1987
Inventor
Bradford P. Purcell
Assignee (at issue)
IMS GmbH
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.