Granted Patent
Utility
US 4,891,656 · App. 07/284,268
Print cartridge with non-divergent electrostatic field
Inventor:
Igor Kubelik
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Dec 14, 1988
Inventor
Igor Kubelik
Assignee (at issue)
Delphax Systems
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.