Granted Patent
Utility
US 4,815,441 · App. 07/174,789
Portable heating appliance
Inventors:
William Schawbel, Thaddeus Zaborowski
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Mar 29, 1988
Inventors
William Schawbel
Thaddeus Zaborowski
Assignee (at issue)
The Schawbel Corporation
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.