Granted Patent
Utility
US 6,797,748 · App. 09/876,984
Polyurethane based inks for writing instruments
Inventors:
Qingping Chen, Michael T. Nowak
Patented Case
View Patent ↗
Granted: Sep 28, 2004
Filed: Jun 8, 2001
Inventors
Qingping Chen
Michael T. Nowak
Assignee (at issue)
SOCIETE BIC
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.