Granted Patent
Utility
US 6,225,608 · App. 09/451,733
Circular film heater
Inventor:
Johan Kallgren
Patented Case
View Patent ↗
Granted: May 1, 2001
Filed: Nov 30, 1999
Inventor
Johan Kallgren
Assignee (at issue)
White Consolidated Industries, 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.