Granted Patent
Utility
US 4,503,578 · App. 06/392,567
Brush assembly apparatus for cleaning cannons
Inventor:
Donald McIntyre
Patented Case
View Patent ↗
Granted: Mar 12, 1985
Filed: Jun 28, 1982
Inventor
Donald McIntyre
Assignee (at issue)
San/Bar Corporation
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.