Granted Patent
Utility
US 4,381,691 · App. 06/223,756
Touch force adjustment means for a piano
Inventors:
Harold A. Conklin, Jr., Pieter W. van Nuis
Patented Case
View Patent ↗
Granted: May 3, 1983
Filed: Jan 9, 1981
Inventors
Harold A. Conklin, Jr.
Pieter W. van Nuis
Assignee (at issue)
Baldwin Piano & Organ 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.