Granted Patent
Utility
US 4,489,858 · App. 06/385,525
Dispensing valve to be used with bottles of fluent imaging material for the development of electrostatic images
Inventor:
Frederick J. Pritchitt
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Jun 7, 1982
Inventor
Frederick J. Pritchitt
Assignee (at issue)
Marpac Industries, Inc.
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.