Granted Patent
Utility
US 4,409,893 · App. 05/852,889
Process for printing porous image
Inventors:
Douglas A. Newman, Robert T. Emerson
Patented Case
View Patent ↗
Granted: Oct 18, 1983
Filed: Nov 18, 1977
Inventors
Douglas A. Newman
Robert T. Emerson
Assignee (at issue)
International Business Machines Corporation
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.