Granted Patent
Utility
US 5,046,938 · App. 07/528,536
Improved multiple layer die head with adjustable gaps
Inventor:
Michael Hirschberger
Patented Case
View Patent ↗
Granted: Sep 10, 1991
Filed: May 25, 1990
Inventor
Michael Hirschberger
Assignee (at issue)
Hoover Universal, 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.