Granted Patent
Utility
US 6,009,421 · App. 08/847,114
Device and method for decreasing web breaks in a printing system based on web tension ratios
Inventors:
Zhenhua Xie, Did-Bun Wong, Robert B. Evans
Patented Case
View Patent ↗
Granted: Dec 28, 1999
Filed: May 1, 1997
Inventors
Zhenhua Xie
Did-Bun Wong
Robert B. Evans
Assignee (at issue)
R.R. DONNELLEY & SONS COMPANY
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.