Granted Patent
Utility
US 5,060,396 · App. 07/395,440
Zoned cylindrical dryer
Inventor:
Dennis L. Hansen
Patented Case
View Patent ↗
Granted: Oct 29, 1991
Filed: Aug 17, 1989
Inventor
Dennis L. Hansen
Assignee (at issue)
W.R. Grace & Co. Conn.
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.