Granted Patent
Utility
US 5,621,442 · App. 08/325,790
Enhanced UU type ink jet printheads
Inventors:
Donald J. Hayes, John R. Pies, David B. Wallace
Patented Case
View Patent ↗
Granted: Apr 15, 1997
Filed: Oct 19, 1994
Inventors
Donald J. Hayes
John R. Pies
David B. Wallace
Assignee (at issue)
Compaq Computer 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.