Granted Patent
Utility
US 6,139,138 · App. 09/291,028
Bellows system for an ink jet pen
Inventors:
James Harold Powers, Matthew Russell
Patented Case
View Patent ↗
Granted: Oct 31, 2000
Filed: Apr 13, 1999
Inventors
James Harold Powers
Matthew Russell
Assignee (at issue)
Lexmark International, 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.