Granted Patent
Utility
US 4,494,129 · App. 06/446,821
Electrostatic printing apparatus
Inventor:
Vladimir Gretchev
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Dec 3, 1982
Inventor
Vladimir Gretchev
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.