Granted Patent
Utility
US 4,472,880 · App. 06/340,778
Annular saw blade and annular saw
Inventor:
Mats Johansson
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: Jan 19, 1982
Inventor
Mats Johansson
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.