Granted Patent
Utility
US 4,745,421 · App. 07/014,408
Ionic print cartridge and printer
Inventors:
Robert McCallum, Paul E. Plasschaert, Dolf Landheer, Hemant Gandhi
Patented Case
View Patent ↗
Granted: May 17, 1988
Filed: Apr 17, 1987
Inventors
Robert McCallum
Paul E. Plasschaert
Dolf Landheer
Hemant Gandhi
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.