Granted Patent
Utility
US 4,933,217 · App. 06/923,080
Method for external liquid smoke treatment of cellulosic food casings and casings produced thereby
Inventor:
Herman S. Chiu
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Oct 24, 1986
Inventor
Herman S. Chiu
Assignee (at issue)
Viskase Companies, 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.