Granted Patent
Utility
US 4,776,321 · App. 07/056,447
Hair roller heating device
Inventors:
William Schawbel, Thaddeus Zaborowski
Patented Case
View Patent ↗
Granted: Oct 11, 1988
Filed: Jun 1, 1987
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.