Granted Patent
Utility
US 4,339,230 · App. 06/142,598
Bifoil blade
Inventor:
Paul Hill
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Apr 22, 1980
Inventor
Paul Hill
Assignee (at issue)
HERCULES LLC
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.