Granted Patent
Utility
US 4,599,851 · App. 06/657,790
Dry toner cartridge system and method of filling same
Inventor:
Brian Williams
Patented Case
View Patent ↗
Granted: Jul 15, 1986
Filed: Oct 4, 1984
Inventor
Brian Williams
Assignee (at issue)
Marpac 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.