Granted Patent
Utility
US 4,911,186 · App. 07/132,064
Convertible hair roller
Inventor:
Fred R. Hayden
Patented Case
View Patent ↗
Granted: Mar 27, 1990
Filed: Dec 11, 1987
Inventor
Fred R. Hayden
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.