Granted Patent
Utility
US 4,448,872 · App. 06/426,335
Duplex imaging with pressure transfixing
Inventor:
Casey S. Vandervalk
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Sep 29, 1982
Inventor
Casey S. Vandervalk
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.