Granted Patent
Utility
US 6,406,285 · App. 09/422,483
Apparatus for measuring and of controlling the gap between polymer sheet cooling rolls
Inventor:
Frank R. Nissel
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: Oct 21, 1999
Inventor
Frank R. Nissel
Assignee (at issue)
Welex Incorporated
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.