Granted Patent
Utility
US 5,980,231 · App. 08/986,977
Thermoforming machine with linear recirculation of sheet holding frames
Inventors:
Albert W. Arends, Victor L. Chun, Roland Karklin
Patented Case
View Patent ↗
Granted: Nov 9, 1999
Filed: Dec 8, 1997
Inventors
Albert W. Arends
Victor L. Chun
Roland Karklin
Assignee (at issue)
Brown Machine, LLC
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.