Granted Patent
Utility
US 5,010,354 · App. 07/442,746
Ink jet pen with improved volumetric efficiency
Inventors:
Bruce Cowger, John H. Dion, William E. Peters
Patented Case
View Patent ↗
Granted: Apr 23, 1991
Filed: Nov 28, 1989
Inventors
Bruce Cowger
John H. Dion
William E. Peters
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.