Granted Patent
Utility
US 5,749,715 · App. 08/800,452
Circulation-heating element device
Inventor:
Karsten Laing
Patented Case
View Patent ↗
Granted: May 12, 1998
Filed: Feb 18, 1997
Inventor
Karsten Laing
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.