Granted Patent
Utility
US 4,397,184 · App. 06/310,579
Method and apparatus for testing xerographic developer mix
Inventors:
Neil R. Bankert, Steven R. Heyer, Lawrence Viele
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Oct 9, 1981
Inventors
Neil R. Bankert
Steven R. Heyer
Lawrence Viele
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.