Granted Patent
Utility
US 4,456,915 · App. 06/466,275
Print head for high resolution electrothermal printing apparatus
Inventors:
Walter Crooks, Cameron H. Hafer, William J. Weiche
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: Feb 14, 1983
Inventors
Walter Crooks
Cameron H. Hafer
William J. Weiche
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.