Granted Patent
Utility
US 4,811,861 · App. 07/045,223
Homogeneously fusion bonded cartridges
Inventor:
John T. Roberts
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Apr 29, 1987
Inventor
John T. Roberts
Assignee (at issue)
Poly-Pro, 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.