Granted Patent
Utility
US 4,807,508 · App. 07/121,605
Direct coupled bridge construction for acoustic stringed instruments
Inventor:
Kazuo Yairi
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Nov 17, 1987
Inventor
Kazuo Yairi
Assignee (at issue)
St. Louis Music Supply Company
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.