Granted Patent
Utility
US 4,835,554 · App. 07/094,665
Ink jet array
Inventors:
Paul A. Hoisington, Robert R. Schaffer, Kenneth H. Fischbeck
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Sep 9, 1987
Inventors
Paul A. Hoisington
Robert R. Schaffer
Kenneth H. Fischbeck
Assignee (at issue)
Spectra Group Limited, 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.